South Africa v Argentina on Friday 29 October. 20:00 GMT kick-off at the Olympic Stadium.
New Zealand v Australia on Saturday 31 October. 16:00 GMT kick-off at Twickenham.
We will see you there. Bye for now.
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Praise from the Pumas
Argentina 15-29 Australia
Classy stuff from Argentina...
Match stats
Argentina 15-29 Australia
Argentina-Australia
Tries: 0-4
Penalties kicked: 5/5-1/2
Tackles: 95-142
Missed tackles: 28-33
Carries: 137-98
Metres: 556-352
Defenders beaten: 33-28
Clean breaks: 13-7
Turnovers conceded: 21-13
Possession: 55%-45%
Territory: 54%-46%
Australia reach the final
Argentina 15-29 Australia
Australia's defensive line has been battered more in the past 80 minutes than it has been throughout the whole tournament. That's literally - as the pictures of David Pocock's bloodied face show. And metaphorically - as the tackling statistics show. The Wallabies were forced into more tackles by the Pumas than any other opponent at this World Cup.
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Player reaction - Pocock
Argentina 15-29 Australia
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Australia number eight David Pocock on ITV: "It was incredibly tough - as we knew it would be. Credit to Argentina, it was physical, but both teams looked to use the ball and both teams were working hard until the 80th minute.
"I thought there were a few pieces of finishing from our back line which was the difference but it was tough."
Aussie blueprint
The blueprint for Australia for next Saturday's final against New Zealand will be 8 August.
The Wallabies trailed the All Blacks 19-17 with 11 minutes left in their Rugby Championship decider on that day.
Quote Message: What we did was let the game open up which suited them. I'm really happy with the lads' defence. We had to work hard to stop them from scoring a try. We can improve again and that's really important now. Now tonight we can think we've given ourselves a chance to play in a final and we will work out how we will do it against a dynamic team. from Australia head coach Michael Cheika
What we did was let the game open up which suited them. I'm really happy with the lads' defence. We had to work hard to stop them from scoring a try. We can improve again and that's really important now. Now tonight we can think we've given ourselves a chance to play in a final and we will work out how we will do it against a dynamic team.
"Ignore the whinging poms"
Australian media mogul Rupert Murdoch is happy.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"This performance from Argentina was amazing. The way they've adapted their game with their back line - they have come on leaps and bounds. They will grow and grow. This will give them heart to perform at a higher level."
Lies, damned lies and statistics
Argentina 15-29 Australia
Do statistics tell the full story? Nope, not always. Argentina shaded possession and edged territory, but the more adventurous Australians deserve their place in the World Cup final after a four-try win.
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"Fair bit out of the tank"
Argentina 15-29 Australia
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Quote Message: It was a tough game and we knew it would be. We had to defend a lot. We have an opportunity in a final now. That took a fair bit out of the tank. We know the task next week is huge, we have to recover well. from Australia captain Stephen Moore
It was a tough game and we knew it would be. We had to defend a lot. We have an opportunity in a final now. That took a fair bit out of the tank. We know the task next week is huge, we have to recover well.
"One hell of a final"
Argentina 15-29 Australia
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Australia when the opportunities came were so clinical. The skill level was very high. There's a huge question mark over the front five and whether New Zealand will exploit that. But purely on their finishing, they will be a threat in the final. If they get parity against New Zealand in that front five it will be one hell of a final."
Australia reach the final
Argentina 15-29 Australia
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Argentina 15-29 Australia
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Australia coach Michael Chieka folds away his glasses and shakes a supporter's hand. It was the result he expected, mission still to be fully accomplished.
Argentina counterpart Daniel Hourcade by contrast is melting into slow, tired tears.
A dream has died. But what a thing of beauty it was while it lived.
Full-time
Argentina 15-29 Australia
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Hat-trick hero
Argentina 15-29 Australia
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Argentina 15-29 Australia
Argentina spills the ball as they chance their arm once too many. Adam Ashley-Cooper booms a kick back down to their end of the field to send them back to square one.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They've both come to play. There have been so many half breaks. Argentina were too fast and loose in the first 10 minutes. They've tried to adapt and they have to learn when to use their strengths."
Barnes - from both sides
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Argentina 15-29 Australia
Argentina are throwing it about with abandon. As they must. Joaquin Tuculet darting up into the Aussie 22m, but the support is sluggish.
There are some tired Argentines out there.
Argentina 15-29 Australia
The replay of the scoring pass between Drew Mitchell and Adam Ashley-Cooper suggests the ball drifted forward between the two Australians.
It looked fine on first viewing, but Wayne Barnes would have had a tough call to make had he sent it up to the big screen.
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Argentina 15-29 Australia
Argentina coach Daniel Hourcade had his head in his hands as Adam Ashley-Cooper dotted down.
This has gone for the Pumas.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"That is the difference in one play. The short side is exploited. Drew Mitchell - what a decision from Michael Cheika to bring him back."
Converted try - Ashley-Cooper
Argentina 15-29 Australia
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A Bledisloe World Cup final it is then.
Drew Mitchell cuts the Argentina defence to ribbons with an electric burst and then jagging step off his left wing. Blue and white shirts falling off the Wallaby and he finally manages to connect up with fellow wing Adam Ashley-Cooper for a stroll in.
That is Ashley-Cooper's hat-trick. And Bernard Foley rubs salt into the wounds.
Argentina 15-22 Australia
Another over-ambitious off-load from Argentina and Australia snatch the ball back.
Are the Pumas trying too hard? A little more brain and a little less adrenaline and they will be able to find a way through Australia's defence.
Argentina 15-22 Australia
Australia are continuing to dominate the turnover count as they have done throughout the tournament, winning nine to Argentina's four. And that man David Pocock is leading the way...
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Argentina 15-22 Australia
Butterfingers. The ball gets away from Kurtley Beale on halfway and the Pumas snaffle possession.
There is space for whichever team has the ball in hand...
Argentina 15-22 Australia
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Tatafu Polota-Nau gets lucky as David Pocock clears up his over-throw at line-out time on the Argentina 22m.
Pocock's work goes to waste though as Michael Hooper is boshed by Marcelo Bosch in midfield and the Pumas fly-hack upfield.
Replacement
Argentina 15-22 Australia
Dean Mumm and Nick Phipps replace second row Rob Simmons and scrum-half Will Genia for Australia.
Pressure's on
Argentina 15-22 Australia
Former Scotland international Gregor Townsend sees tiredness creeping in...
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Folau was not looking well. That ankle must be worse than they said. He's not looked his best."
Replacement
Argentina 15-22 Australia
Australia full-back Israel Folau was a doubt for this game and it looks like his race is run.
Matt Toomua is on in his place.
Argentina 15-22 Australia
Australia come up with the turnover just when they need it.
And they were gifted it by scrum-half Tomas Cubelli whose toe stubs the ball into the path of Tatafu Polota-Nau.
A basic mistake to allow the Aussies off the hook when the Pumas had them pinned in the 22m.
Argentina 15-22 Australia
Argentina break up into the Australia 22m.
Suddenly the green and gold is at sixes and sevens...
Argentina 15-22 Australia
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Israel Folau opts to kick as he gathers the ball on halfway. It is straight into his own man.
Scrum-down Argentina for the accidental offside.
Australia allowed Scotland back from the dead in a game they should have had sewn up. Are they about to do it again?
Action areas
Argentina 15-22 Australia
Argentina still edging the possession. Argentina still edging the territory. But Australia are still edging the scoreline. Tense.
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Missed drop-goal
Argentina 15-22 Australia
Bernard Foley takes on a drop-goal shot from 35m. He has plenty of time to line it up as some heavy-legged Argentina forward barely jog out of the defensive line towards him, but it is a dud.
Short, wide and it doesn't even make the in-goal area.
Replacement
Argentina 15-22 Australia
The third change to the Aussie front row as hooker Stephen Moore departs and Tatafu Polota-Nau is on in his place.
Argentina 15-22 Australia
Argentina's front row are still milking the scrum for penalties.
The Pumas win a fourth penalty at the set-piece - even though the Aussies have brought on props Toby Smith and Greg Holmes to try and shore it up.
Argentina 15-22 Australia
Argentina are within a converted try of their opponents, all because of Nicolas Sanchez's trusty right peg. Left touchline? Right touchline? Anywhere in-between? All no bother for the Argentina fly-half who has a flawless record of five kicks from five.
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Argentina 15-22 Australia
Magic from Kurtley Beale! A deft chip over the top from the Aussie replacement, gathered by Bernard Foley.
Foley throws a big pass to try and find the lurking Adam Ashley-Cooper on the wing.
Argentina's defenders suddenly have another few mph in their legs through. They flood across and snuff out the danger, winning a turnover.
Argentina 15-22 Australia
A change at scrum-half for Argentina as Tomas Cubelli replaces Martin Landajo.
Cubelli has been lively in this tournament. Can he swing the game his side's way?
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
ReutersCopyright: Reuters
"Sanchez is a lovely kicker of the ball. Argentina, now with the dominance in the front row, need to play the game in the right areas. It's about field position and then tightening the noose around the Australia front five."
Bring the noise
Argentina 15-22 Australia
BBC Radio Five live's Ed Marriage giving us a sense of what it's like inside the ground...
Penalty - Sanchez
Argentina 15-22 Australia
Nicolas Sanchez slides his kick through the centre. Unerring stuff.
The Pumas are like a bad smell that the Aussies cannot quite shake off.
Argentina 12-22 Australia
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Rob Simmons collides with the Pumas line-out jumper as he chases Julian Montoya's throw.
Penalty Argentina and this is bang in Sanchez country.
Replacement
Argentina 12-22 Australia
Michael Cheika pulls the emergency cord on the front row.
Both props off as Toby Smith and Greg Holmes replace James Slipper and Sekope Kepu.
Argentina 12-22 Australia
Spilled!
Australia nab the loose ball and Will Genia boots away upfield.
But Joaquin Tuculet runs back with intent into the Aussie half. Lovely jinking run and play is opening up, wide green pockets for the runners to exploit.
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Argentina 12-22 Australia
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Half-break! Argentina wriggle through a gap and play is back up to the Aussie 22m line.
The crowd are rumbling their approval.
Argentina 12-22 Australia
Australia burgle the breakdown yet again. Michael Hooper and David Pocock are chief suspects as the Wallabies ease the pressure on their own 22m.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"It's been a hectic eight minutes - it's all been going on. For Australia, they've played most of the game in the Argentina 22 because of Argentina's lack of exit experience in just clearing it."
Penalty - Foley
Argentina 12-22 Australia
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Whistles, jeers and 40 metres of Twickenham turf to overcome, but Bernard Foley's connection is clean and the ball tumbles through the slot.
Argentina 12-19 Australia
Juan Martin Fernandez Lobbe's dirty mitts are all over the ball on the floor as he chases up an aimless punt forward from back-row colleague Leonardo Senatore.
Penalty Australia and another test of Bernard Foley's nerves...
Argentina 12-19 Australia
Argentina are up to within seven points.
That creaky Aussie scrum is what they need to target to close that gap further.
Penalty - Sanchez
Argentina 12-19 Australia
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Australia's scrum is looking like their Achilles heel once again.
A third scrum penalty for Argentina as James Slipper is prised off the floor again as the Pumas pour pressure through the Aussie loose-head.
Bang in front and Nicolas Sanchez sends it over.
Replacement
Argentina 9-19 Australia
Argentina are being gutted of experience.
Juan Martin Hernandez is the latest pillar of the team to be taken out by injury. Jeronimo de la Fuente is on in his place.
Ruthless Wallabies
Argentina 9-19 Australia
Ahead of kick-off we spoke about Argentina's lethal attack (albeit against easier opposition than Australia) during the tournament. But, as the offensive stats show, it is the three-try Wallabies who have been the most clinical.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They have to revert back to the old Argentina to win this game. They have to get the dominance up front and grind out the penalties."
Missed penalty
Argentina 9-19 Australia
Bernard Foley is looking a little flaky off the tee.
The Australia fly-half sends one wobbling wide to the delight of most of the crowd in Twickenham.
Kick-off
Argentina 9-19 Australia
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Santiago Cordero gathers the kick-off, but has the ball pinched from him from Scott Fardy.
The Pumas get desperate as they attempt to recover the situation and they have stretched Wayne Barnes' patience too far.
Penalty and Bernard Foley is going to set his sights on the sticks.
Argentina 9-19 Australia
Argentina head coach Daniel Hourcade acted out his team-talk in mime as well as rapid-fire Spanish.
The teams are back out. Let's get going.
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App chat
Argentina 9-19 Australia
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The new BBC Sport app is more personalised than a French wing's favourite boots. You can pick the teams and sports that matter to you so that the stories you want to read float to the top of the pile every time.
The Aussies are edging the possession stats, although the bulk of the action sees Argentina trying to batter a hole in the Wallabies defence between the halfway line and their own 22. But, as we all know, the key statistic is the one which is 19-9 in favour of Australia...
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Not over for Argentina
Argentina 9-19 Australia
Ex-England men Brian Moore and Will Greenwood have some encouraging words for Argentina...
Diego says relax
Argentina 9-19 Australia
The Argentine emperor says that the Pumas live to fight for the second half.
Diego's boys have been under the cosh for all of it and will be happy to only be 10 points adrift.
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Half-time
Argentina 9-19 Australia
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Santiago Cordero, the angle of his running is clever, he avoids the big guys and runs on their blind shoulders. He's been a revelation. and so have the Argentina back line."
Ace Ashley-Cooper
Argentina 9-19 Australia
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Half-time
Argentina 9-19 Australia
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Why did he need to throw the miracle ball? Why did he need to be flash? Just pop it up and they score. The chance is missed. The difference so far - two chances for Argentina, no tries. Australia have been clinical."
Argentina 9-19 Australia
So close! Just one more pass to hand and the Pumas would be in... but it dribbles agonisingly to the floor.
It was a lovely shuffling, side-stepping break from Santiago Cordero - a neat offload to Juan Martin Hernandez - but El Mago is snared by Bernard Foley.
He flips the ball out towards Joaquin Tuculet. The full-back would have had a stroll in, but the ball is wide of his hands and to the deck.
Argentina 9-19 Australia
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Argentina are finishing the half well.
Marcelo Bosch makes yards. Leonardo Senatore rumbles on. They are up to the Aussie 22m.
Argentina 9-19 Australia
Sin-bin period over as Argentina are restored to their full complement by the return of Tomas Lavanini from the sin-bin.
Three minutes to half-time.
Penalty - Sanchez
Argentina 9-19 Australia
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Prop Sekope Kepu encroaches at the line-out around halfway. Was there a bit of back-chat?
Wayne Barnes marches another 10 metres to bring it within range. Nicolas Sanchez pops it over to keep the Pumas just about in touch.
Argentina 6-19 Australia
It is defcon one for Argentina at the moment.
They are a man down and the Aussies are tearing strips off them in attack.
They have to batten down, make it to half-time and plot the revolution from there.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They get the numbers on the left and then the money ball is a beauty from Giteau. It's the right ball but they had extra men everywhere. They work the overlap and then have the class to finish it off."
Try - Ashley-Cooper
Argentina 6-19 Australia
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Australia sniff the gap and ruthlessly exploit the under-staffed Argentina defence.
Matt Giteau slings a perfectly calibrated mis-pass wide and Adam Ashley-Cooper does not have to even break stride as he steams into the corner.
One silver lining for Argentina is Bernard Foley's horribly screwed conversion attempt.
Argentina 6-14 Australia
Argentina defending bravely with 14, but there is space out wide...
Replacement
Argentina 6-14 Australia
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Argentina lose another key man - this time to injury.
Captain and hooker Agustin Creevy is off and fresh-faced Julian Montoya is on.
Pocock the menace
Argentina 6-14 Australia
Argentina 6-14 Australia
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Cheers from the Twickenham crowd who are fast massing behind Argentina.
The Aussies have infringed as they try and roll a maul around the front end of the line-out.
Scrum down Argentina. And Wayne Barnes upgrades that to a penalty as the Pumas turn the screw at the set-piece.
Argentina are winning that particular battle.
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Spoiling the breakdown
Argentina 6-14 Australia
Every superlative in the dictionary has been used to describe the impact of Australian back-row pair Michael Hooper and David Pocock during this tournament. And here's why. Hooper is already leading the tackle count today with five, while Pocock - dubbed the thieving jackal of the Aussie pack - has already nabbed two turnovers.
Game's gone?
Argentina 6-14 Australia
Former England captain Will Carling has shared his opinion on Tomas Lavanini's yellow card...
Argentina 6-14 Australia
Australia have a kickable penalty, but they sense a chance to go for the jugular with the Pumas a key line-out forward down.
They go for the corner rather than the posts...
'Pathetic decision'
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
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"No no no come on. Wayne Barnes, that is a pathetic decision. Absolutely ludicrous. This is a World Cup semi - not a park game. The fall out of that could be the end of this game as a spectacle."
Sin-bin
Argentina 6-14 Australia
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Argentina second row Tomas Lavanini is off for a 10-minute sit-down.
I think he is a little unlucky. He has sent Israel Folau tumbling nose over toe by charging shoulder first into the Australia full-back's shins.
It looks dangerous, but the lock looked like he was trying to wrap the arm and was probably just thankful to make any contact at all with speedster Folau.
Argentina down to 14 and a big 10 minutes to come.
Penalty - Sanchez
Argentina 6-14 Australia
Over she blows.
Nicolas Sanchez strokes his kicks like Blofeld strokes his cat - with love, care and a hint of menace.
The gap is down to eight.
Argentina 3-14 Australia
Take that Mario.
Argentina draw first blood at scrum time as Ramiro Herrera cleaves through James Slipper, popping his opposite number skywards.
Penalty Argentina and they are going to kick it...
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"For the sake of the game we want an Argentina try. But for all their attacking options they haven't really threatened - apart from Bosch's break. It's two opportunities well taken by Australia and they look the most threatening with ball in hand."
Action areas
Argentina 3-14 Australia
Argentina have been holding on to the ball more than their Australian opponents in the opening 20 minutes - but that is the match in a nutshell. The Argentines have coughed up possession too easily, with the ruthless Wallabies punishing them.
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Argentina 3-14 Australia
Australia steal!
Nothing going for the Pumas at the moment as Agustin Creevy's throw is spilled off the top.
Argentina finally get their hands on it, but the Pumas are all too upright to get the drive going.
Held up and it is scrum Australia.
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Argentina 3-14 Australia
Argentina boot up to within five metres of the Australia line from a penalty.
An airborne Bernard Foley looks like he has clawed the ball back into play, but the officials award the line-out the Pumas' way.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"You can't get isolated by Pocock. You know he's going to be the first man at the breakdown, you just need to clear him. He is absolutely immense - his timing of the jackal and his angles of running are so destructive."
Argentina 3-14 Australia
David Pocock is already making every breakdown into a royal rumble of a wrestle.
The Australia number eight secures a precious turnover right where it matters - in the shadow of his own sticks.
Replacement
Argentina 3-14 Australia
More trouble for Argentina.
Flying wing Juan Imhoff is off for a head examination. Lucas Ambrosino is on in his place.
Argentina 3-14 Australia
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Great work from Marcelo Bosch.
The Pumas centre is not the quickest, but he is a crafty breakdown operator and he earns Argentina a penalty up in the Aussie half as he gets over the top of the tackled Israel Folau.
Argentina 3-14 Australia
A lovely piece of high-wire walking from Santiago Cordero in defence as he fields a kick into the Puma's backfield and, with his back to the chasing Aussies, sells the on-rushing Adam Ashley-Cooper an audacious dummy.
Classy and something for the Pumas fans to cheer.
"Every team's nightmare"
Argentina 3-14 Australia
England and Northampton Saints full-back Ben Foden showing some sympathy for Argentina right now...
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Both teams are looking for the numbers and that extra man on the outside. There have been opportunities for both sides, but Australia have taken theirs."
Rapid Wallabies
Argentina 3-14 Australia
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Argentina 3-14 Australia
Australia are giving Argentina a taste of the medicine the Pumas dished out to Ireland last weekend.
Their lightning start continues as Tevita Kuridrani makes big yards in midfield.
The Pumas are looking very leaky in defence. Diego Maradona is drinking deeply of something comforting.
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Ashley-Cooper up to third
Argentina 3-14 Australia
Argentina 3-14 Australia
I would think the All Blacks are enjoying watching this.
Neither side looks watertight in defence.
"Delicious"
Argentina 3-14 Australia
Wales and Gloucester back James Hook enjoyed that Australia try...
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"It's a beautiful pass - they've read the blitz defence. It's a long ball over the top and it's just about reading the opposition. It's a very narrow defence and one pass beats the lot of them."
Converted try - Ashley-Cooper
Argentina 3-14 Australia
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It all comes from a fluffed tap and go from Martin Landajo.
Australia punish the Puma scrum-half's knock-on with a rock-solid scrum, a switch of direction in the backline and Bernard Foley's looping mis-pass to Adam Ashley-Cooper.
He scampers into the corner and Foley lands the extras from a testing angle.
It is a long way back already for the Argentines.
More round-ball support for Pumas
Argentina 3-7 Australia
West Ham’s Argentine striker Mauro Zarate, fresh from scoring the opener in Saturday’s win 2-1 over Chelsea, hopes to complete a memorable sporting weekend at Twickenham.
He'll be delighted the Pumas are on the board after that shaky start.
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Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"It's a shame Joaquin Tuculet wasn't on Bosch's shoulder because that would have been an easy try. I think Pocock over read it, although it's a brilliant move from Argentina. Unfortunately there is nobody in support."
Penalty - Sanchez
Argentina 3-7 Australia
Nicolas Sanchez strokes the ball over and the way they carved through the Wallabies to set it up will give them massive encouragement.
Argentina 0-7 Australia
Australia stem the bleeding. Marcelo Bosch is dragged down by a superb cover tackle by Bernard Foley and the green and gold flood back to prevent the quick recycle.
But only at the expense of a penalty...
Argentina 0-7 Australia
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This is as open as we had hoped.
Both sides have brought their sense of adventure.
Marcelo Bosch comes flying through a huge gap in midfield.
Pulled down just short by Bernard Foley. Breathless stuff.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They've both come to play, haven't they? That's well read by Simmons, it's a brilliant take. It's dangerous play from Sanchez, but it's a wonderful intercept."
Converted try - Simmons
Argentina 0-7 Australia
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Disaster for the Pumas!
Just 67 seconds on the clock on the clock when Aussie second row Rob Simmons banks on Nicolas Sanchez's pass and nabs the off-load.
Off he gallops under the sticks for an interception try from 40 metres out and Bernard Foley makes no mistake with the extras.
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Kick-off
Argentina 0-0 Australia
Referee Wayne Barnes puts lips to whistle.
Juan Martin Hernandez puts boot to ball with a reverse kick-off to the backs.
That has been gathered safely by Israel Folau.
Cry for me Argentina...
Argentina v Australia (16:00 GMT)
BBC Radio 5 Live
Will there be more tears shed from Argentina's players when the national anthem is played?
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Quote Message: We are very emotional people and we have that in our DNA. That’s not enough if you playing against Australia, New Zealand and South Africa. You also have to play really well. We played really well against New Zealand for 60 minutes but they stepped it up. To make history Argentina have to win the next game." from Agustin Pichot Argentina 2007 semi-finalist
We are very emotional people and we have that in our DNA. That’s not enough if you playing against Australia, New Zealand and South Africa. You also have to play really well. We played really well against New Zealand for 60 minutes but they stepped it up. To make history Argentina have to win the next game."
Anthems
Argentina v Australia (16:00 BST)
It is lucky that these Argentine forwards are built like brick outhouses.
There are some big, big emotions rattling around in the Pumas bellies at anthem time and it takes all their restraint to keep the tears at bay.
The Aussies respond with a version of Advance Australia Fair that is high on volume, low on tune.
We're ready.
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Teams out
Argentina v Australia (16:00 GMT)
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Horns locked, backs slapped and instructions bellowed in the Argentina dressing room as the Pumas feel friendly human contact for one final time before heading over the top.
Out come the two teams into watery autumn sunshine, amid stirring strings and crackling pyrotechnics.
Twickenham a picture, the stage is set.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Nicolas Sanchez is the player who's impressed me more than anyone for Argentina. He gets the timing right on when you move it. I think they will target the Australian scrum, but if they have the opportunities, they now have the ability and confidence to go wide."
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Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"This one is very special. Everyone expects Australia to play as better than they did against Scotland. David Pocock is back - and Israel Folau, who has had a quiet World Cup; today could be the day for that player, he is world class."
5 live sports extra coverage
Argentina v Australia (16:00 GMT)
You can get across the 5 live sport extra commentary by clicking on the audio icon at the top of this page.
If you have, for some reason, to play it super-subtle keeping up with the score this afternoon, then may I suggest our Rugby World Cup alerts.
Pumas ready to party
Argentina v Australia (16:00 GMT)
BBC Sport's Sonja McLaughlan has found some impressive wigs among the Argentina faithful.
Ledesma's split loyalties
Australia v Argentina (16:00 GMT)
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It won't just be the Windsors who have played out some serious split family loyalties at Twickenham during this tournament.
Spare a thought for the Ledesma clan.
Mario was a keystone of the Argentina front row at the 1999, 2003 and 2007 World Cups.
Come 2015 though and he is the coach who has whipped the Wallaby scrum into shape, perhaps fatally undermining his country's hopes of a first World Cup final.
Australia head coach Michael Cheika has given him licence to blast out the Argentine anthem though, perhaps hoping that gets the patriotism out of his system pre kick-off.
"I want him to love that. He’s still very proud and I wouldn’t expect him to be any other way,” said Cheika.
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Celeb fan watch
Argentina v Australia (16:00 GMT)
Maradona may have got in early for Argentina. Hugh Jackman sent his support to the Wallabies a whole 48 hours before kick-off.
True fact: One of Jackman's co-stars in the X-Men series is Daniel Cudmore, younger brother of Canada captain Jamie.
Maradona in his seat
Argentina v Australia (16:00 GMT)
Confirmation from the great man himself... Diego Maradona is lending his considerable sporting weight to the Pumas efforts today and is installed in a Twickenham executive box.
While Simply Red's Mick Hucknall appeared on the in-stadium television screen, he took the chance to pose with friends and post this snap to his Facebook page.
Diego MaradonaCopyright: Diego Maradona
History boys?
Argentina v Australia (16:00 GMT)
Quote Message: In 2007 we didn’t know what we were doing and suddenly we were in a semi-final. This Argentina team wants to do something much greater than what we did and they can achieve that against Australia." from Agustin Pichot Captain of Argentina team which finished third in 2007
In 2007 we didn’t know what we were doing and suddenly we were in a semi-final. This Argentina team wants to do something much greater than what we did and they can achieve that against Australia."
Tired Wallabies?
Argentina v Australia (16:00 GMT)
BBC Radio 5 Live
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Quote Message: Australia took Scotland a little bit for granted in the quarter-final but you have to look at the three matches they played before that. They had a big game against Wales, before that it was England, six days earlier Uruguay. The big challenge for the Wallabies is how they reignite this team. How are they going to refresh them?” from Tim Horan Former Australia centre
Australia took Scotland a little bit for granted in the quarter-final but you have to look at the three matches they played before that. They had a big game against Wales, before that it was England, six days earlier Uruguay. The big challenge for the Wallabies is how they reignite this team. How are they going to refresh them?”
Can the Wallabies reach their first final since 2003?
Quote Message: The Wallabies are slight favourites but when you look at how good Argentina were against Ireland they are going to be very hard to beat. Australia only just I think." from Tim Horan Former Australia centre
The Wallabies are slight favourites but when you look at how good Argentina were against Ireland they are going to be very hard to beat. Australia only just I think."
'Pumas can cause upset'
Argentina v Australia (16:00 GMT)
Matt Dawson
2003 World Cup winner on BBC Radio 5 live
Getty ImagesCopyright: Getty Images
Quote Message: Argentina remind us of how France used to play. If they turn that individual flare and culture on I do truly believe they have a chance.”
Argentina remind us of how France used to play. If they turn that individual flare and culture on I do truly believe they have a chance.”
Turnover thief-in-chief
Argentina v Australia (16:00 GMT)
David Pocock has won more turnovers (10) than any other player going into the semi-final stage of this year’s event, despite playing just 219 minutes.
Live Reporting
Mike Henson
All times stated are UK
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Argentina 15-29 Australia
Just two matches to go.
South Africa v Argentina on Friday 29 October. 20:00 GMT kick-off at the Olympic Stadium.
New Zealand v Australia on Saturday 31 October. 16:00 GMT kick-off at Twickenham.
We will see you there. Bye for now.
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Praise from the Pumas
Argentina 15-29 Australia
Classy stuff from Argentina...
Match stats
Argentina 15-29 Australia
Argentina-Australia
Tries: 0-4
Penalties kicked: 5/5-1/2
Tackles: 95-142
Missed tackles: 28-33
Carries: 137-98
Metres: 556-352
Defenders beaten: 33-28
Clean breaks: 13-7
Turnovers conceded: 21-13
Possession: 55%-45%
Territory: 54%-46%
Australia reach the final
Argentina 15-29 Australia
Australia's defensive line has been battered more in the past 80 minutes than it has been throughout the whole tournament. That's literally - as the pictures of David Pocock's bloodied face show. And metaphorically - as the tackling statistics show. The Wallabies were forced into more tackles by the Pumas than any other opponent at this World Cup.
Player reaction - Pocock
Argentina 15-29 Australia
Australia number eight David Pocock on ITV: "It was incredibly tough - as we knew it would be. Credit to Argentina, it was physical, but both teams looked to use the ball and both teams were working hard until the 80th minute.
"I thought there were a few pieces of finishing from our back line which was the difference but it was tough."
Aussie blueprint
The blueprint for Australia for next Saturday's final against New Zealand will be 8 August.
The Wallabies trailed the All Blacks 19-17 with 11 minutes left in their Rugby Championship decider on that day.
But a 10-point scoring burst from replacement scrum-half Nic White turned the tables and put the silverware on the Aussies' mantelpiece.
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'We can improve'
"Ignore the whinging poms"
Australian media mogul Rupert Murdoch is happy.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"This performance from Argentina was amazing. The way they've adapted their game with their back line - they have come on leaps and bounds. They will grow and grow. This will give them heart to perform at a higher level."
Lies, damned lies and statistics
Argentina 15-29 Australia
Do statistics tell the full story? Nope, not always. Argentina shaded possession and edged territory, but the more adventurous Australians deserve their place in the World Cup final after a four-try win.
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"Fair bit out of the tank"
Argentina 15-29 Australia
"One hell of a final"
Argentina 15-29 Australia
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Australia when the opportunities came were so clinical. The skill level was very high. There's a huge question mark over the front five and whether New Zealand will exploit that. But purely on their finishing, they will be a threat in the final. If they get parity against New Zealand in that front five it will be one hell of a final."
Australia reach the final
Argentina 15-29 Australia
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Argentina 15-29 Australia
Australia coach Michael Chieka folds away his glasses and shakes a supporter's hand. It was the result he expected, mission still to be fully accomplished.
Argentina counterpart Daniel Hourcade by contrast is melting into slow, tired tears.
A dream has died. But what a thing of beauty it was while it lived.
Full-time
Argentina 15-29 Australia
Hat-trick hero
Argentina 15-29 Australia
Argentina 15-29 Australia
Argentina spills the ball as they chance their arm once too many. Adam Ashley-Cooper booms a kick back down to their end of the field to send them back to square one.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They've both come to play. There have been so many half breaks. Argentina were too fast and loose in the first 10 minutes. They've tried to adapt and they have to learn when to use their strengths."
Barnes - from both sides
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Argentina 15-29 Australia
Argentina are throwing it about with abandon. As they must. Joaquin Tuculet darting up into the Aussie 22m, but the support is sluggish.
There are some tired Argentines out there.
Argentina 15-29 Australia
The replay of the scoring pass between Drew Mitchell and Adam Ashley-Cooper suggests the ball drifted forward between the two Australians.
It looked fine on first viewing, but Wayne Barnes would have had a tough call to make had he sent it up to the big screen.
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Argentina 15-29 Australia
Argentina coach Daniel Hourcade had his head in his hands as Adam Ashley-Cooper dotted down.
This has gone for the Pumas.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"That is the difference in one play. The short side is exploited. Drew Mitchell - what a decision from Michael Cheika to bring him back."
Converted try - Ashley-Cooper
Argentina 15-29 Australia
A Bledisloe World Cup final it is then.
Drew Mitchell cuts the Argentina defence to ribbons with an electric burst and then jagging step off his left wing. Blue and white shirts falling off the Wallaby and he finally manages to connect up with fellow wing Adam Ashley-Cooper for a stroll in.
That is Ashley-Cooper's hat-trick. And Bernard Foley rubs salt into the wounds.
Argentina 15-22 Australia
Another over-ambitious off-load from Argentina and Australia snatch the ball back.
Are the Pumas trying too hard? A little more brain and a little less adrenaline and they will be able to find a way through Australia's defence.
Argentina 15-22 Australia
Australia are continuing to dominate the turnover count as they have done throughout the tournament, winning nine to Argentina's four. And that man David Pocock is leading the way...
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Argentina 15-22 Australia
Butterfingers. The ball gets away from Kurtley Beale on halfway and the Pumas snaffle possession.
There is space for whichever team has the ball in hand...
Argentina 15-22 Australia
Tatafu Polota-Nau gets lucky as David Pocock clears up his over-throw at line-out time on the Argentina 22m.
Pocock's work goes to waste though as Michael Hooper is boshed by Marcelo Bosch in midfield and the Pumas fly-hack upfield.
Replacement
Argentina 15-22 Australia
Dean Mumm and Nick Phipps replace second row Rob Simmons and scrum-half Will Genia for Australia.
Pressure's on
Argentina 15-22 Australia
Former Scotland international Gregor Townsend sees tiredness creeping in...
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Folau was not looking well. That ankle must be worse than they said. He's not looked his best."
Replacement
Argentina 15-22 Australia
Australia full-back Israel Folau was a doubt for this game and it looks like his race is run.
Matt Toomua is on in his place.
Argentina 15-22 Australia
Australia come up with the turnover just when they need it.
And they were gifted it by scrum-half Tomas Cubelli whose toe stubs the ball into the path of Tatafu Polota-Nau.
A basic mistake to allow the Aussies off the hook when the Pumas had them pinned in the 22m.
Argentina 15-22 Australia
Argentina break up into the Australia 22m.
Suddenly the green and gold is at sixes and sevens...
Argentina 15-22 Australia
Israel Folau opts to kick as he gathers the ball on halfway. It is straight into his own man.
Scrum-down Argentina for the accidental offside.
Australia allowed Scotland back from the dead in a game they should have had sewn up. Are they about to do it again?
Action areas
Argentina 15-22 Australia
Argentina still edging the possession. Argentina still edging the territory. But Australia are still edging the scoreline. Tense.
Missed drop-goal
Argentina 15-22 Australia
Bernard Foley takes on a drop-goal shot from 35m. He has plenty of time to line it up as some heavy-legged Argentina forward barely jog out of the defensive line towards him, but it is a dud.
Short, wide and it doesn't even make the in-goal area.
Replacement
Argentina 15-22 Australia
The third change to the Aussie front row as hooker Stephen Moore departs and Tatafu Polota-Nau is on in his place.
Argentina 15-22 Australia
Argentina's front row are still milking the scrum for penalties.
The Pumas win a fourth penalty at the set-piece - even though the Aussies have brought on props Toby Smith and Greg Holmes to try and shore it up.
Argentina 15-22 Australia
Argentina are within a converted try of their opponents, all because of Nicolas Sanchez's trusty right peg. Left touchline? Right touchline? Anywhere in-between? All no bother for the Argentina fly-half who has a flawless record of five kicks from five.
Argentina 15-22 Australia
Magic from Kurtley Beale! A deft chip over the top from the Aussie replacement, gathered by Bernard Foley.
Foley throws a big pass to try and find the lurking Adam Ashley-Cooper on the wing.
Argentina's defenders suddenly have another few mph in their legs through. They flood across and snuff out the danger, winning a turnover.
Argentina 15-22 Australia
A change at scrum-half for Argentina as Tomas Cubelli replaces Martin Landajo.
Cubelli has been lively in this tournament. Can he swing the game his side's way?
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Sanchez is a lovely kicker of the ball. Argentina, now with the dominance in the front row, need to play the game in the right areas. It's about field position and then tightening the noose around the Australia front five."
Bring the noise
Argentina 15-22 Australia
BBC Radio Five live's Ed Marriage giving us a sense of what it's like inside the ground...
Penalty - Sanchez
Argentina 15-22 Australia
Nicolas Sanchez slides his kick through the centre. Unerring stuff.
The Pumas are like a bad smell that the Aussies cannot quite shake off.
Argentina 12-22 Australia
Rob Simmons collides with the Pumas line-out jumper as he chases Julian Montoya's throw.
Penalty Argentina and this is bang in Sanchez country.
Replacement
Argentina 12-22 Australia
Michael Cheika pulls the emergency cord on the front row.
Both props off as Toby Smith and Greg Holmes replace James Slipper and Sekope Kepu.
Argentina 12-22 Australia
Spilled!
Australia nab the loose ball and Will Genia boots away upfield.
But Joaquin Tuculet runs back with intent into the Aussie half. Lovely jinking run and play is opening up, wide green pockets for the runners to exploit.
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Argentina 12-22 Australia
Half-break! Argentina wriggle through a gap and play is back up to the Aussie 22m line.
The crowd are rumbling their approval.
Argentina 12-22 Australia
Australia burgle the breakdown yet again. Michael Hooper and David Pocock are chief suspects as the Wallabies ease the pressure on their own 22m.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"It's been a hectic eight minutes - it's all been going on. For Australia, they've played most of the game in the Argentina 22 because of Argentina's lack of exit experience in just clearing it."
Penalty - Foley
Argentina 12-22 Australia
Whistles, jeers and 40 metres of Twickenham turf to overcome, but Bernard Foley's connection is clean and the ball tumbles through the slot.
Argentina 12-19 Australia
Juan Martin Fernandez Lobbe's dirty mitts are all over the ball on the floor as he chases up an aimless punt forward from back-row colleague Leonardo Senatore.
Penalty Australia and another test of Bernard Foley's nerves...
Argentina 12-19 Australia
Argentina are up to within seven points.
That creaky Aussie scrum is what they need to target to close that gap further.
Penalty - Sanchez
Argentina 12-19 Australia
Australia's scrum is looking like their Achilles heel once again.
A third scrum penalty for Argentina as James Slipper is prised off the floor again as the Pumas pour pressure through the Aussie loose-head.
Bang in front and Nicolas Sanchez sends it over.
Replacement
Argentina 9-19 Australia
Argentina are being gutted of experience.
Juan Martin Hernandez is the latest pillar of the team to be taken out by injury. Jeronimo de la Fuente is on in his place.
Ruthless Wallabies
Argentina 9-19 Australia
Ahead of kick-off we spoke about Argentina's lethal attack (albeit against easier opposition than Australia) during the tournament. But, as the offensive stats show, it is the three-try Wallabies who have been the most clinical.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They have to revert back to the old Argentina to win this game. They have to get the dominance up front and grind out the penalties."
Missed penalty
Argentina 9-19 Australia
Bernard Foley is looking a little flaky off the tee.
The Australia fly-half sends one wobbling wide to the delight of most of the crowd in Twickenham.
Kick-off
Argentina 9-19 Australia
Santiago Cordero gathers the kick-off, but has the ball pinched from him from Scott Fardy.
The Pumas get desperate as they attempt to recover the situation and they have stretched Wayne Barnes' patience too far.
Penalty and Bernard Foley is going to set his sights on the sticks.
Argentina 9-19 Australia
Argentina head coach Daniel Hourcade acted out his team-talk in mime as well as rapid-fire Spanish.
The teams are back out. Let's get going.
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App chat
Argentina 9-19 Australia
The new BBC Sport app is more personalised than a French wing's favourite boots. You can pick the teams and sports that matter to you so that the stories you want to read float to the top of the pile every time.
Read more about it here and spruce up your Android and IOS devices today.
Half-time
Argentina 9-19 Australia
The Aussies are edging the possession stats, although the bulk of the action sees Argentina trying to batter a hole in the Wallabies defence between the halfway line and their own 22. But, as we all know, the key statistic is the one which is 19-9 in favour of Australia...
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Not over for Argentina
Argentina 9-19 Australia
Ex-England men Brian Moore and Will Greenwood have some encouraging words for Argentina...
Diego says relax
Argentina 9-19 Australia
The Argentine emperor says that the Pumas live to fight for the second half.
Diego's boys have been under the cosh for all of it and will be happy to only be 10 points adrift.
Half-time
Argentina 9-19 Australia
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Santiago Cordero, the angle of his running is clever, he avoids the big guys and runs on their blind shoulders. He's been a revelation. and so have the Argentina back line."
Ace Ashley-Cooper
Argentina 9-19 Australia
Half-time
Argentina 9-19 Australia
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Why did he need to throw the miracle ball? Why did he need to be flash? Just pop it up and they score. The chance is missed. The difference so far - two chances for Argentina, no tries. Australia have been clinical."
Argentina 9-19 Australia
So close! Just one more pass to hand and the Pumas would be in... but it dribbles agonisingly to the floor.
It was a lovely shuffling, side-stepping break from Santiago Cordero - a neat offload to Juan Martin Hernandez - but El Mago is snared by Bernard Foley.
He flips the ball out towards Joaquin Tuculet. The full-back would have had a stroll in, but the ball is wide of his hands and to the deck.
Argentina 9-19 Australia
Argentina are finishing the half well.
Marcelo Bosch makes yards. Leonardo Senatore rumbles on. They are up to the Aussie 22m.
Argentina 9-19 Australia
Sin-bin period over as Argentina are restored to their full complement by the return of Tomas Lavanini from the sin-bin.
Three minutes to half-time.
Penalty - Sanchez
Argentina 9-19 Australia
Prop Sekope Kepu encroaches at the line-out around halfway. Was there a bit of back-chat?
Wayne Barnes marches another 10 metres to bring it within range. Nicolas Sanchez pops it over to keep the Pumas just about in touch.
Argentina 6-19 Australia
It is defcon one for Argentina at the moment.
They are a man down and the Aussies are tearing strips off them in attack.
They have to batten down, make it to half-time and plot the revolution from there.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They get the numbers on the left and then the money ball is a beauty from Giteau. It's the right ball but they had extra men everywhere. They work the overlap and then have the class to finish it off."
Try - Ashley-Cooper
Argentina 6-19 Australia
Australia sniff the gap and ruthlessly exploit the under-staffed Argentina defence.
Matt Giteau slings a perfectly calibrated mis-pass wide and Adam Ashley-Cooper does not have to even break stride as he steams into the corner.
One silver lining for Argentina is Bernard Foley's horribly screwed conversion attempt.
Argentina 6-14 Australia
Argentina defending bravely with 14, but there is space out wide...
Replacement
Argentina 6-14 Australia
Argentina lose another key man - this time to injury.
Captain and hooker Agustin Creevy is off and fresh-faced Julian Montoya is on.
Pocock the menace
Argentina 6-14 Australia
Argentina 6-14 Australia
Cheers from the Twickenham crowd who are fast massing behind Argentina.
The Aussies have infringed as they try and roll a maul around the front end of the line-out.
Scrum down Argentina. And Wayne Barnes upgrades that to a penalty as the Pumas turn the screw at the set-piece.
Argentina are winning that particular battle.
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Spoiling the breakdown
Argentina 6-14 Australia
Every superlative in the dictionary has been used to describe the impact of Australian back-row pair Michael Hooper and David Pocock during this tournament. And here's why. Hooper is already leading the tackle count today with five, while Pocock - dubbed the thieving jackal of the Aussie pack - has already nabbed two turnovers.
Game's gone?
Argentina 6-14 Australia
Former England captain Will Carling has shared his opinion on Tomas Lavanini's yellow card...
Argentina 6-14 Australia
Australia have a kickable penalty, but they sense a chance to go for the jugular with the Pumas a key line-out forward down.
They go for the corner rather than the posts...
'Pathetic decision'
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"No no no come on. Wayne Barnes, that is a pathetic decision. Absolutely ludicrous. This is a World Cup semi - not a park game. The fall out of that could be the end of this game as a spectacle."
Sin-bin
Argentina 6-14 Australia
Argentina second row Tomas Lavanini is off for a 10-minute sit-down.
I think he is a little unlucky. He has sent Israel Folau tumbling nose over toe by charging shoulder first into the Australia full-back's shins.
It looks dangerous, but the lock looked like he was trying to wrap the arm and was probably just thankful to make any contact at all with speedster Folau.
Argentina down to 14 and a big 10 minutes to come.
Penalty - Sanchez
Argentina 6-14 Australia
Over she blows.
Nicolas Sanchez strokes his kicks like Blofeld strokes his cat - with love, care and a hint of menace.
The gap is down to eight.
Argentina 3-14 Australia
Take that Mario.
Argentina draw first blood at scrum time as Ramiro Herrera cleaves through James Slipper, popping his opposite number skywards.
Penalty Argentina and they are going to kick it...
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"For the sake of the game we want an Argentina try. But for all their attacking options they haven't really threatened - apart from Bosch's break. It's two opportunities well taken by Australia and they look the most threatening with ball in hand."
Action areas
Argentina 3-14 Australia
Argentina have been holding on to the ball more than their Australian opponents in the opening 20 minutes - but that is the match in a nutshell. The Argentines have coughed up possession too easily, with the ruthless Wallabies punishing them.
Argentina 3-14 Australia
Australia steal!
Nothing going for the Pumas at the moment as Agustin Creevy's throw is spilled off the top.
Argentina finally get their hands on it, but the Pumas are all too upright to get the drive going.
Held up and it is scrum Australia.
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Argentina 3-14 Australia
Argentina boot up to within five metres of the Australia line from a penalty.
An airborne Bernard Foley looks like he has clawed the ball back into play, but the officials award the line-out the Pumas' way.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"You can't get isolated by Pocock. You know he's going to be the first man at the breakdown, you just need to clear him. He is absolutely immense - his timing of the jackal and his angles of running are so destructive."
Argentina 3-14 Australia
David Pocock is already making every breakdown into a royal rumble of a wrestle.
The Australia number eight secures a precious turnover right where it matters - in the shadow of his own sticks.
Replacement
Argentina 3-14 Australia
More trouble for Argentina.
Flying wing Juan Imhoff is off for a head examination. Lucas Ambrosino is on in his place.
Argentina 3-14 Australia
Great work from Marcelo Bosch.
The Pumas centre is not the quickest, but he is a crafty breakdown operator and he earns Argentina a penalty up in the Aussie half as he gets over the top of the tackled Israel Folau.
Argentina 3-14 Australia
A lovely piece of high-wire walking from Santiago Cordero in defence as he fields a kick into the Puma's backfield and, with his back to the chasing Aussies, sells the on-rushing Adam Ashley-Cooper an audacious dummy.
Classy and something for the Pumas fans to cheer.
"Every team's nightmare"
Argentina 3-14 Australia
England and Northampton Saints full-back Ben Foden showing some sympathy for Argentina right now...
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Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Both teams are looking for the numbers and that extra man on the outside. There have been opportunities for both sides, but Australia have taken theirs."
Rapid Wallabies
Argentina 3-14 Australia
Argentina 3-14 Australia
Australia are giving Argentina a taste of the medicine the Pumas dished out to Ireland last weekend.
Their lightning start continues as Tevita Kuridrani makes big yards in midfield.
The Pumas are looking very leaky in defence. Diego Maradona is drinking deeply of something comforting.
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Ashley-Cooper up to third
Argentina 3-14 Australia
Argentina 3-14 Australia
I would think the All Blacks are enjoying watching this.
Neither side looks watertight in defence.
"Delicious"
Argentina 3-14 Australia
Wales and Gloucester back James Hook enjoyed that Australia try...
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"It's a beautiful pass - they've read the blitz defence. It's a long ball over the top and it's just about reading the opposition. It's a very narrow defence and one pass beats the lot of them."
Converted try - Ashley-Cooper
Argentina 3-14 Australia
It all comes from a fluffed tap and go from Martin Landajo.
Australia punish the Puma scrum-half's knock-on with a rock-solid scrum, a switch of direction in the backline and Bernard Foley's looping mis-pass to Adam Ashley-Cooper.
He scampers into the corner and Foley lands the extras from a testing angle.
It is a long way back already for the Argentines.
More round-ball support for Pumas
Argentina 3-7 Australia
West Ham’s Argentine striker Mauro Zarate, fresh from scoring the opener in Saturday’s win 2-1 over Chelsea, hopes to complete a memorable sporting weekend at Twickenham.
He'll be delighted the Pumas are on the board after that shaky start.
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Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"It's a shame Joaquin Tuculet wasn't on Bosch's shoulder because that would have been an easy try. I think Pocock over read it, although it's a brilliant move from Argentina. Unfortunately there is nobody in support."
Penalty - Sanchez
Argentina 3-7 Australia
Nicolas Sanchez strokes the ball over and the way they carved through the Wallabies to set it up will give them massive encouragement.
Argentina 0-7 Australia
Australia stem the bleeding. Marcelo Bosch is dragged down by a superb cover tackle by Bernard Foley and the green and gold flood back to prevent the quick recycle.
But only at the expense of a penalty...
Argentina 0-7 Australia
This is as open as we had hoped.
Both sides have brought their sense of adventure.
Marcelo Bosch comes flying through a huge gap in midfield.
Pulled down just short by Bernard Foley. Breathless stuff.
Post update
Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"They've both come to play, haven't they? That's well read by Simmons, it's a brilliant take. It's dangerous play from Sanchez, but it's a wonderful intercept."
Converted try - Simmons
Argentina 0-7 Australia
Disaster for the Pumas!
Just 67 seconds on the clock on the clock when Aussie second row Rob Simmons banks on Nicolas Sanchez's pass and nabs the off-load.
Off he gallops under the sticks for an interception try from 40 metres out and Bernard Foley makes no mistake with the extras.
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Kick-off
Argentina 0-0 Australia
Referee Wayne Barnes puts lips to whistle.
Juan Martin Hernandez puts boot to ball with a reverse kick-off to the backs.
That has been gathered safely by Israel Folau.
Cry for me Argentina...
Argentina v Australia (16:00 GMT)
BBC Radio 5 Live
Will there be more tears shed from Argentina's players when the national anthem is played?
Anthems
Argentina v Australia (16:00 BST)
It is lucky that these Argentine forwards are built like brick outhouses.
There are some big, big emotions rattling around in the Pumas bellies at anthem time and it takes all their restraint to keep the tears at bay.
The Aussies respond with a version of Advance Australia Fair that is high on volume, low on tune.
We're ready.
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Teams out
Argentina v Australia (16:00 GMT)
Horns locked, backs slapped and instructions bellowed in the Argentina dressing room as the Pumas feel friendly human contact for one final time before heading over the top.
Out come the two teams into watery autumn sunshine, amid stirring strings and crackling pyrotechnics.
Twickenham a picture, the stage is set.
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"Nicolas Sanchez is the player who's impressed me more than anyone for Argentina. He gets the timing right on when you move it. I think they will target the Australian scrum, but if they have the opportunities, they now have the ability and confidence to go wide."
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Jonathan Davies
Former Wales fly-half on BBC Radio 5 live sports extra
"This one is very special. Everyone expects Australia to play as better than they did against Scotland. David Pocock is back - and Israel Folau, who has had a quiet World Cup; today could be the day for that player, he is world class."
5 live sports extra coverage
Argentina v Australia (16:00 GMT)
You can get across the 5 live sport extra commentary by clicking on the audio icon at the top of this page.
If you have, for some reason, to play it super-subtle keeping up with the score this afternoon, then may I suggest our Rugby World Cup alerts.
Pumas ready to party
Argentina v Australia (16:00 GMT)
BBC Sport's Sonja McLaughlan has found some impressive wigs among the Argentina faithful.
Ledesma's split loyalties
Australia v Argentina (16:00 GMT)
It won't just be the Windsors who have played out some serious split family loyalties at Twickenham during this tournament.
Spare a thought for the Ledesma clan.
Mario was a keystone of the Argentina front row at the 1999, 2003 and 2007 World Cups.
Come 2015 though and he is the coach who has whipped the Wallaby scrum into shape, perhaps fatally undermining his country's hopes of a first World Cup final.
Australia head coach Michael Cheika has given him licence to blast out the Argentine anthem though, perhaps hoping that gets the patriotism out of his system pre kick-off.
"I want him to love that. He’s still very proud and I wouldn’t expect him to be any other way,” said Cheika.
Celeb fan watch
Argentina v Australia (16:00 GMT)
Maradona may have got in early for Argentina. Hugh Jackman sent his support to the Wallabies a whole 48 hours before kick-off.
True fact: One of Jackman's co-stars in the X-Men series is Daniel Cudmore, younger brother of Canada captain Jamie.
Maradona in his seat
Argentina v Australia (16:00 GMT)
Confirmation from the great man himself... Diego Maradona is lending his considerable sporting weight to the Pumas efforts today and is installed in a Twickenham executive box.
While Simply Red's Mick Hucknall appeared on the in-stadium television screen, he took the chance to pose with friends and post this snap to his Facebook page.
History boys?
Argentina v Australia (16:00 GMT)
Tired Wallabies?
Argentina v Australia (16:00 GMT)
BBC Radio 5 Live
Australia's campaign so far
Australia v Argentina (16:00 GMT)
Pool stages:
Won 28-13 against Fiji
Won 65-3 against Uruguay
Won 33-13 against England
Won 15-6 against Wales
Quarter-finals:
Won 35-34 against Scotland
Argentina's campaign so far
Australia v Argentina (16:00 GMT)
Pool stages:
Lost 26-16 to New Zealand
Won 54-6 against Georgia
Won 45-16 against Tonga
Won 64-19 against Namibia
Quarter final:
Won 43-20 against Ireland
'Wallabies slight favourites'
Argentina v Australia (16:00 GMT)
BBC Radio 5 Live
Can the Wallabies reach their first final since 2003?
'Pumas can cause upset'
Argentina v Australia (16:00 GMT)
Matt Dawson
2003 World Cup winner on BBC Radio 5 live
Turnover thief-in-chief
Argentina v Australia (16:00 GMT)
David Pocock has won more turnovers (10) than any other player going into the semi-final stage of this year’s event, despite playing just 219 minutes.
Australia team news
Argentina v Australia (16:00 GMT)
Key pair David Pocock and Israel Folau return to the Wallabies side after missing last week's quarter-final win over Scotland.
Number eight Pocock (calf) and full-back Folau (ankle) have been declared fit to play after a full-contact training session on Friday.
Prop Scott Sio (elbow) is replaced by James Slipper.
Replacements: Tatafu Polota-Nau, Toby Smith, Greg Holmes, Dean Mumm, Ben McCalman, Nick Phipps, Matt Toomua, Kurtley Beale.