Night! See you all tomorrow, I believe it's Aimee Lewis kicking us off.
- Leader Jordan Spieth -16 (70)
- Rose -12 (67), Mickelson -11 (67)
- Hoffman -10 (71), Johnson -6 (73)
- McIlroy -6 (68), Woods -6 (68), Casey -5 (74)
- Use live coverage tab to watch up to five live streams
- Radio 5 live coverage from 21:00
Hi, I'm still here. Should Spieth win tomorrow, he will win Texas a 13th Green Jacket. The last was Ben Crenshaw in 1995. I don't know who the others were. Sorry.
Masters leader Jordan Spieth, speaking to the BBC: "If you'd told me I was going to make seven birdies today, on Saturday, when it's meant to be harder, I'd have called you crazy. With a lead you want to limit the mistakes which I didn't do so well but I grinded it out.
"I looked at the scoreboard very little today, not really until the end. I'll take the same attitude tomorrow. I'm not going to think about being in the lead. I've got two major champions behind me and it's not going to be easy but I'm in a position I'm happy with."
Sergio Garcia told us he and Tiger Woods would get along when they were paired yesterday. Our reporter John Murray said they barely interacted on the fairways but Sergio feels no beef...
World number one Rory McIlroy, speaking after it was noted he was the same age (21) as Spieth when he blew a four-shot lead going into the final round in 2011: "He's already experienced it once. I think he'll have learned from that and will definitely do better than I did."
I don't think we'll be hanging about for too much longer. Praise be for Jordan Spieth's double-bogey at 17, and I mean that in the nicest possible way...
Former American professional golfer on BBC Radio 5 live
"Justin Rose, not taking anything away from what a great player he is, doesn't have the intimidation factor Phil Mickelson has. Psychologically, and dynamically, it's a little bit easier for Spieth to play with Rose than with Mickelson."
Ian Poulter took to Twitter (again) earlier to tell us he "left a few out there" despite shooting 67.
The Englishman stands proudly at the top of the pile for finding greens in regulation today, hitting 17 from 18.
Phil Mickelson and Sergio Garcia come in second - hitting 15 of 18.
The strong man of the day is Jason Day.
His whopping 334 yard drive cannot be beaten but on average, Dustin Johnson is still the long hitter of this Masters with big blows averaging 321.67 yards over three days.
Where can Justin Rose, Phil Mickelson and their fellow Spieth-chasing buddies bring the lead down tomorrow? The par fives.
Statistically, they are the four easiest holes on the course, all four of them are averaging less than five blows. Dustin Johnson eagled three of them on Friday and made birdie at the other.
Kerry Thomas: Fabulous round, Justin Rose. Sleep well. We're all rooting for you. Tom Maher: I'm sure Rory could give Spieth some useful advice on keeping a four-shot Masters lead.
Ouch. Rory McIlroy famously let a four-shot 54-hole Masters lead slip in 2011 before going on to win the US Open two months later for his first major.
Phil Mickelson, speaking to BBC Sport: "I had a lot of fun, this is the best scenario you can ask for as a professional golfer - you dream of playing late in the afternoon at Augusta and having an opportunity to win. If I can play a good front nine tomorrow, and that is my goal, I can hopefully be in contention on the back nine."
BBC Sport commentator
"Jordan Spieth came through a stiff test with stunning colours. When he has been in a sticky spot he has managed to come out of it really well.
"His mental strength is amazing. He takes one stroke at a time and takes the good and the bad. It is about being patient, not taking any risks and he does that."
Justin Rose, speaking to BBC Sport: "The back nine was a lot of fun. The putt at seven really got things going. To finish like I did gives me a lot of momentum going into tomorrow.
"Jordan is playing flawless golf right now. It is a big lead but Augusta has a habit of throwing things up on the back nine so the key is to stay in contention going on to the back nine."
Spieth leads by four
-16 Spieth (US)
-12 Rose (Eng)
-11 Mickelson (US)
-10 Hoffman (US)
-6 McIlroy (NI), Woods (US), Streelman (US), Na (US), D. Johnson (US)
Selected others: -4 Poulter (Eng); -3 Garcia (Spa); -1 Scott (Aus), B. Watson (US)
Justin Rose has moved beautifully up the leaderboard today and his putting had much to do with the progression.
He was dead-eye, averaging just 1.44 strokes on the green - including one three putt. In the entire field, only Hunter Mahan was as good, also taking 1.44 blows on the dance floor.
Thank the golfing gods for those two charges by Mickelson and Rose, but for them it might have been a procession for Spieth tomorrow - and not great viewing. Ian Poulter of England matched their five-under 67s, which was the lowest score of the day.
Jordan Spieth is conquering...
His new mark of -16 means Floyd's effort in 1976 and Woods' in 1997 are consigned to the 'former record' bin.
... Spieth starts it a touch left of the hole and it obeys his command, ducking right and in - in it goes for a round of 70, -16 and a four-shot lead over Justin Rose in second. Hoffman follows him in for birdie and a 71, he's six back.
BBC Sport commentator
"That was excellent - a nerveless shot, absolutely perfect."
... that's a tremendous effort, brought the ball down on the fringe and scurried his ball to within nine or 10 feet...
Spieth has left himself a beast of a shot, over the collar of a bunker - he's going to have to go high and mighty and see if it sticks...
Spieth has blinked again - a big cry of 'FORE RIGHT!' and his ball flies head-high into the patrons. Wild. Hoffman parachutes in to within a few feet of the pin.
20 of the last 24 Masters champions have come from the final pairing, so with Justin Rose edging to 12 under par with a birdie at the last and Jordan Spieth 16 under through 17, you'd bet on either the young American clinching a first major or Rose adding a second to his 2013 US Open victory.
Dustin misses with his par attempt, falls back to six under after a disappointing 73. That was some putt from Rose, slicker than cat sick across linoleum.
Rose for birdie at the last, slippery... NAILED IT! What a putt that was, the Englishman is in with a 67, including five birdies in the last six holes, and is outright second and four off the lead.
That double from Spieth has made the weekend that much more interesting. All of a sudden, the aches in Mickelson's limbs will be miraculously easing - that's what hope feels like. Spieth safely away at 18, as is Hoffman.
Spieth's par putt comes up well short, he's got a fair few feet left for bogey. Rose takes an age over his second shot at 18 and that's a fine result, although it's a snakey one coming down the hill. Another shot gone for Hoffman at 17, he drops back to -9, where he started the day. Spieth makes a double...
John Daly has spent the week selling his products on a table outside Augusta National.
"The 1995 Open champion is standing with his fiancée, Anna, in the car park of a Hooters, the chain of raucous bars staffed by scantily clad waitresses,"writes Oliver Holt in the Daily Mail.
"Now he does not drink. His focus is more on the three trestle tables loaded with John Daly merchandise. He has not played the US Masters since 2006 but he has been coming to Augusta for more than a decade to make money selling his products. He still does a brisk trade.
"His 45ft motor home is parked next to the stall. It's his pride and joy. Daly and Anna sleep in it during Masters week. Daly often sleeps in it when it is parked outside his homes in Clearwater, Florida, and Arkansas. It has Florida plates that read 'Lion 95'."
BBC Sport commentator
"He was thinking too much about that one. There was enough room to pitch that and that is where he shows his youthfulness, a slight agitation that comes too quickly."
Casey couldn't get much going to day and he's bogeyed the last for a 74 and -5 overall. Spieth has duffed his chip at 17, he'll be dropping a shot here. Glimmers of hope for the chasing pack...
Rose makes par at 17, stays 11 under. Here's Spieth from behind a couple of trees - and with a very laid-back camera standing no more than 15 yards straight in front of him - and he manages to scoop it up there, 20 yards short of the green. Mickelson with eight feet left for birdie at 18... misses by a whisker, cards 67 for 11 under and seven off the current lead.
That's rotten luck for Dustin on 17, his chip ricocheting off the stick and off the green in another direction. Mind you, it was going miles by. Rose's chip just comes up short, he should knock that in for par.
... I think it's definitely safe to start saying Spieth is playing Tiger-esque, he's just pulled his tee shot at 17 into the trees...
Spieth has nailed another one at 16 to open up a seven-shot lead, this really is Tiger-esque now, I think it's safe to start saying it...
Mickelson for par at 17 and he hasn't hit it, he drops back to -11 and six off the lead. Casey makes his par, he stays six under. Here's Rose into the 17th and his ball creeps off the front of the green and disappears out of sight, like a cat burglar retreating from a spotlit roof.
Tough day for Ernie, he's three over after 17 and two under for the week. Spieth at 16, and that's another doozy, stiffed it to within 10 feet. Hoffman nearly sticks his in, he should bounce straight back after that bogey at 15.