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Summary

  1. Roger Federer beats Gael Monfils in five sets
  2. Monfils takes 1st set 6-4 & 2nd set 6-3
  3. Federer takes next three 6-4 7-5 6-2
  4. Marin Cilic through to the semi-finals after beating Tomas Berdych 6-2 6-4 7-6 (7-4)
  5. Click audio speaker or 'Live Coverage' for BBC Radio 5 live commentary
  6. *Denotes next to serve

Live Reporting

By Aimee Lewis

All times stated are UK

Get involved

  1. Post update

    That's a wrap, ladies and gentlemen. There is nothing to see here other than waffle. There will be more live text commentary later in the day of the women's semi-finals.

    China's Peng Shuai and 10th seed Caroline Wozniacki will begin their fight for the final from around 18:45 BST, and at about 20:45 BST Serena Williams will continue her title defence, this time by taking on Russia's Ekaterina Makarova.

  2. Post update

    Lendl coaching return with Berdych?

    Russell Fuller

    BBC tennis correspondent at Flushing Meadows

    Ivan Lendl

    "After his defeat to Marin Cilic in the US Open quarter-finals, Tomas Berdych raised the possibility that he might soon start working with Andy Murray's former coach Ivan Lendl.

    "Lendl and Murray went their separate ways in March, as Lendl didn't want to spend as many weeks on tour as Murray required.

    "But he did say at the start of the US Open that he could return to coaching in future, and linking up with Berdych would give him the chance to work with a fellow Czech."

    Berdych said he had his "fingers crossed" over a Lendl link-up in his post-match interview - read the full report here.

  3. Post update

    That's the semi-final line ups sorted. Roger Federer (and Stefan Edberg) will take on Marin Cilic (and Goran Ivanisevic) while Novak Djokovic (and Boris Becker) must pit their wits against Kei Nishikori (and Michael Chang). Should be interesting. Very interesting.

  4. Get involved

    Golfer Justin Rose: Roger Federer you are a role model man! Heart of a champion!! That was fun to watch how things can change in sport.

  5. Post update

    Gael Monfils

    A match of what ifs for Monfils, who was two sets up and had two match points. Three hours and 20 minutes of bamboozling and enthralling tennis. In the end it was perhaps the 10 double faults which proved costly.

  6. Post update

    "I started to serve huge in the fifth, it was my best set serving," adds Federer. "You've just got to give it all you have each point. I hope, and think, you guys enjoyed it.

    Roger Federer and Marin Cilic

    Federer on his semi-final opponent Marin Cilic: "Marin's played some great tennis in New York over the years and he's improved under (coach) Goran (Ivanisevic). I'm looking forward to playing Marin, he's a great guy, we had a tough match in Tornonto. We know what to expect but I'm looking forward to the match."

  7. Post update

    "Unbelievable. Incredible," says Federer with not a word of hyperbole. "I think it was awesome from both sides. Thanks for supporting us, it helped me to get it done for sure.

    "I still thought the finishing line was far for Gael (when he was two sets up) and I knew I could play better. When I was down two match points I thought 'this is it', go down fighting, don't miss a shot and let him have it but I served well and stayed in the match and somehow turned it around. I felt great in the fifth."

  8. Game, set and match

    Federer 4-6 3-6 6-4 7-5 6-2 Monfils*

    Roger Federer

    Monfils has enough left in the tank to approach the net, but Federer simply passes him. The five-time champion rattles off another two points quickly. Three match points. A big serve down the 'T', Monfils chasing fresh air. A fist-pumping celebration from the second seed. What a match.

  9. Post update

    *Federer 4-6 3-6 6-4 7-5 5-2 Monfils

    Monfils breathing heavily, looking like a man who has run a marathon in oppressive heat. He races to a 40-0 lead and although Federer eats into the lead, the Frenchman easily hold. Federer, perhaps, conserving energy.

  10. Post update

    Federer 4-6 3-6 6-4 7-5 5-1 Monfils*

    There's a better chance of fish learning to climb trees than Monfils dragging himself back into contention from here. Another stylish volley from Federer takes him to within a game of what would be an incredible victory.

  11. Post update

    Gigi Salmon

    BBC Radio 5 live commentator

    "Monfils is looking a little bit petulant. There's a mutter to himself, but that's not a bad thing when it comes to Monfils as I think it's how he keeps himself going. He can't be thinking that he had a 2-0 lead. He has to start from scratch. The unforced errors are flying off the racquet of Monfils."

  12. Federer breaks

    *Federer 4-6 3-6 6-4 7-5 4-1 Monfils

    Monfils spraying wide, spraying long. He looks towards his racquet, searching for answers but he will find none. Three break points Federer. The Swiss needs just the one, he steps forward, crunching a winning forehand into the corner. The fat lady is gargling some mouthwash and is preparing to come on stage.

  13. Post update

    Federer 4-6 3-6 6-4 7-5 3-1 Monfils*

    Federer with cat-like reflexes at the net even after over three hours of trouble and toil. Monfils attempts an eye-catching in-between-the-legs shot but, in truth, he had given up on the point because there was no hope of passing the second seed. A comfortable serve for Federer.

  14. Get involved at #bbctennis

    Chasey: "Need to go to bed but Federer is keeping me busy!"

    Ahmed: "Monfils showing incredible poise. Unfortunately Federer's the people's champion. What a legend."

    Alex Rose: "Can't believe Roger Federer is only 33. Seems like he has been around the game for so long."

    Aidan Mifsud: "When Monfils plays even the errors are exciting."

    Aidan, you're not wrong. The flamboyant Frenchman has got to be the best value for money on the circuit. Just checking out the new balls is an art form.

  15. Post update

    *Federer 4-6 3-6 6-4 7-5 2-1 Monfils

    Gael Monfils

    The Monfils double faults in double digits and, at 15-30, Federer has an opportunity to kill off his opponent. But the Swiss carelessly nets for 30-30 and Monfils comes through the adversity by serving big and serving hard.

  16. Post update

    Federer 4-6 3-6 6-4 7-5 2-0 Monfils*

    The Frenchman's legs have turned to guacamole. Monfils can offer no resistance. He swings wildly at a Federer serve at 40-15 and turns towards the baseline, shoulders slumped, to prepare to launch some serves.

  17. Post update

    Jill Craybas, US former professional tennis player on BBC Radio 5 live

    "That's the first indication for me that Monfils is looking a little bit deflated. Federer took a long bathroom break after the fourth set and I don't know if that's had an effect. Maybe that's shifted the momentum even more. That's a sloppy game from Monfils, but Federer stayed really consistent in that game."

  18. Federer breaks

    *Federer 4-6 3-6 6-4 7-5 1-0 Monfils

    Here's something to chew on. Federer has come back from two sets down on eight occasions and has won 22 and lost 19 five-set matches. Monfils has won 12 of 20 so it's the Frenchman who enjoys a better record when a match goes the distance.

    Federer nicks two early points, Monfils swaying like a punch-drunk heavyweight, and drills a tired backhand into the tramlines. Three break points. Monfils has one big punch left in him, but no more than that as he goes long once again.

  19. Post update

    Federer leaves the court, but only temporarily, and in the meantime Monfils stretches the hamstrings. And breathe...

  20. Game and fourth set

    Federer 4-6 3-6 6-4 7-5 Monfils*

    Roger Federer

    "Out" yell a couple of spectators during a rally but the players carry on until Monfils nets on the opening point. "Please do not call out during the rally," says Carlos Ramons. The yips also affecting Federer - the Swiss chucking in a double fault for 30-15 - but a well-timed driving volley brings up two set points for the Swiss. Monfils hooks a return way beyond the tramlines. We carry on.

  21. Federer breaks

    *Federer 4-6 3-6 6-4 6-5 Monfils

    What do you do when 22,000 fans are screaming encouragement at your opponent? You go toe-to-toe with him. A cushion-soft touch at the net from Monfils levels matters. 30-30. Monfils seems to push a forehand into the tramlines. HawkEye proves it was a fraction wide. To deuce we go.

    The pair trading blows from the baseline, screams from a section of the yee-hawingly vocal crowd as Federer drags a forehand wide. Advantage. Monfils attempts to pass Federer at the net but has no joy. Deuce. Double fault Monfils. His eighth of the match. Break point Federer. Monfils lethargic. Another double fault. There will be no sleeping on this watch.

  22. Post update

    Federer 4-6 3-6 6-4 5-5 Monfils*

    While his forehand and first serve may have been off key in this match, Federer's net play has been on song. A volley at a zany angle. First point Federer but his forehand falters, gifting Monfils three easy points. Two match points Monfils! Oh my word.

    The world watches on as a Monfils forehand bounces long, seemingly in slow motion. Federer comes to the net, the ploy pays dividends. Danger averted. Monfils goes long! Federer launches down and ace! The five-time champion jumps for joy! The crowd are on their feet! Federer lives on!

    Gael Monfils
  23. Post update

    *Federer 4-6 3-6 6-4 4-5 Monfils

    A double fault from Monfils - his third of the set and seventh of the match - puts Federer on the scoreboard. 15-15. The Federer racquet sparkling - a forehand down the line for 15-30 - but from a high to a series of lows, a netted backhand, a forehand long, and Monfils nips to 40-30. The game is prolonged as the 20th seed screws a forehand long but, just as in previous games, the Frenchman pulls out two brutal serves from his magic box and Federer must serve to stay in the match.

  24. Post update

    Federer 4-6 3-6 6-4 4-4 Monfils*

    Federer is three matches from making more history but Monfils is two games away from writing his own name into a chapter of US Open history. Will it be a first US Open semi-final for the Frenchman or a first semi-final since 2011 for Federer? Rapid-fire serves from Federer for a hold to 15 and the pressure quickly on Monfils once again.

  25. Post update

    Jill Craybas, US former professional tennis player on BBC Radio 5 live

    Gael Monfils

    "It has been quite an intense match and the atmosphere has been awesome. The quality of tennis out here at this late stage of the match is incredible. We are seeing a bit more emotion from Federer, which is very unusual. I think he was surprised by how well Monfils came out at the start of this game, so he's really trying to pump himself to give himself some more energy.

    Even with Monfils being two sets to one up, how close the statistics are show how tight this match is. This is the most focused I've seen Monfils in a match. There's usually more drama, shouting, jumping up and down."

  26. Post update

    *Federer 4-6 3-6 6-4 3-4 Monfils

    Gael Monfils

    "Allez" screams Monfils as a Federer forehand whizzes past him and bounces long for 40-30, but super returning from Federer pushes the game to deuce. Monfils embarking on an entertaining monologue. Is he loosing it or is he revving himself up? It's the latter. An ace to the wings. An ace down the 'T'. Boom! Boom!

  27. Post update

    Federer 4-6 3-6 6-4 3-3 Monfils*

    Monfils's two victories over Federer came on hard courts, but the Swiss does have the superior record. A hold to love from a stern-looking Federer. High-octane stuff.

  28. Post update

    *Federer 4-6 3-6 6-4 2-3 Monfils

    A pumped-up Monfils cries an anguished groan after every shot, but it doesn't seem to be helping because Federer has reined him in to 30-30. A rush of blood to the head from Monfils and Federer has break point - but an overclubbed forehand into the tramlines from the Swiss lets Monfils off the hook.

    The Frenchman talking to himself in his native tongue in between points. The heart is pumping. The adrenaline oozing. Two mammoth aces later - one a swashbuckling 137mph - and the exuberant Monfils is ahead for the first time in the set. Bravo!

  29. Monfils breaks

    Federer 4-6 3-6 6-4 2-2 Monfils*

    The longer the rally, the greater chance of Federer coming out on top. Monfils stretching every sinew to fetch a Federer volley, but even a man of his elasticity struggles and he's outstretched on the floor, having allowed Federer to come back to 30-30. A third ace of the match from Federer but Monfils takes the game to deuce.

    Break point Monfils, his second of the set, Federer saves. Thunderclap of a forehand for a second break point. Federer saves. Third break point - Federer volleys into the tramlines and whacks the net and decides to change his racquet. The Swiss exchanges words with the umpire. "What's wrong with you?" Federer asks Carlos Ramos.

  30. Federer breaks

    *Federer 4-6 3-6 6-4 2-1 Monfils

    Oh, Gael, what are you doing? A drop shot? non, non, non. Federer, like a shark smelling blood, senses that his opponent is feeling the strain. A dreamy backhand winner down the line from the former champion for two break points.

    Monfils refusing to crumble, dragging the game to deuce - the forehand again Federer's foe - but the Swiss is volleying with aplomb and earns third break point. The Frenchman messes up on the baseline, forehand goes long, and Federer's stentorian roar can be heard in Staten Island.

  31. Post update

    Federer 4-6 3-6 6-4 1-1 Monfils*

    Federer continuing to overcook the forehand and soon the alarm bells will ring. Some spectators shuffling uneasily in their seats as Monfils goes 0-30 up, but the Swiss digs deep, drags himself back into contention at 30-30 after coming out on top of a 21-shot rally.

    "Come on," Federer roars as Monfils returns wide - but the second seed again wild on the forehand. Deuce. Jaw-droppingly good counter-punching from Monfils, a thunderous one-two, ending with a forehand into the corner for break point!

    Monfils, the court at his mercy, slaps a backhand into the tape. Federer ups the ante - a fabulous deep backhand volley for advantage and another to see off the danger. Blimey.

  32. Post update

    Gigi Salmon

    BBC Radio 5 live commentator

    "This match is so level that both Federer and Monfils have hit 27 winners and unforced errors apiece.

    "The difference in the third set was Federer made one unforced error compared to Monfils' nine."

  33. Post update

    *Federer 4-6 3-6 6-4 0-1 Monfils

    Who said Monfils had questionable temperament? Cool and crisp serving to go 40-0 up and, other than a grand Federer forehand, the Frenchman has it all his own way.

  34. Game and third set

    Federer 4-6 3-6 6-4 Monfils*

    Roger Federer

    Monfils' radar a little off on the returns as Federer eases to 30-0. The Swiss scoots to the tape, a wonderful volley sends Monfils scrambling and the Swiss sees him off with an overhead. Three set points. He only needs the one. Simple, yet efficient from the Swiss master. We're in for the long haul.

  35. Post update

    *Federer 4-6 3-6 5-4 Monfils

    In a blink of an eye, Monfils has rattled off three points quickly for a 40-0 lead and before I can add a full stop to the end of this sentence, he holds to 15. Federer to serve for the third set. Sleep? No, thanks.

  36. Post update

    Federer 4-6 3-6 5-3 Monfils*

    Monfils continuing to retrieve what seems like the unreachable and his long limbs put Federer on the back foot in the first point, forcing the Swiss to net. Sharp-shooting from Federer, though, from 0-15 to 40-15, and he wraps the game up as Monfils ends a lengthy rally by swinging wide on the forehand.

  37. Post update

    *Federer 4-6 3-6 4-3 Monfils

    There's a lovely ebb and flow to this match. Federer has momentum but the pendulum has swung with such regularity in this set you can never be sure who will pull through. A comfortable hold for Monfils, a challenge rightly going his way.

  38. Post update

    Stat attack

    Gigi Salmon

    BBC Radio 5 live commentator

    Roger Federer

    "Last time Federer came back from 0-2 down was against another Frenchman, Julien Benneteau, at Wimbledon in 2012. He's hade eight career comebacks from 0-2 down and needs to make it a ninth here to make it into the US Open semi-finals."

  39. Post update

    Federer 4-6 3-6 4-2 Monfils*

    The crowd, as you'd expect, rooting for the five-time champion. The 33-year-old continuing to make needless errors, but has enough tricks in his bag to consolidate the break - finishing off with a swashbuckling overhead which the fans thoroughly enjoy.

  40. Get involved at #bbctennis

    Canice: "Used to recall a time when Federer was almost invincible against this type of player..that seem like an era ago."

    Greg Coles: "How well is Gael Monfils playing! Two sets up."

    Usama Zafar: "At last a break of serve for Roger... If somehow he can take this game all the way towards a decider. NOT happening."

  41. Federer breaks

    *Federer 4-6 3-6 3-2 Monfils

    Monfils producing otherworldly shots on Ashe. A loose-limbed forehand touches the line for 30-30 - but from brilliant to bonkers as he coughs up a double fault to present Federer with a break point. And the Swiss matches his opponent for razzle-dazzle. Magnificent! He glides towards the tape, conjures a series of volleys until he knocks Monfils out. The second seed deserves to be allowed to put on his top hat and sing a show tune after that.

  42. Monfils breaks back

    Federer 4-6 3-6 2-2 Monfils*

    A frustrated roar from Federer as he watches his forehand drift wide. Monfils again with a chance at 0-30 and the second seed is creaking. Monfils pounces at the net after a lucky on a net cord and earns three break points.

    One break point saved. Forehand winner. Second break point saved. Another forehand winner. How will it all end? Federer approaches the net... Monfils passes him with a stonking forehand which tickles the line. The second seed's advantage whistling in the wind.

  43. Post update

    Gigi Salmon

    BBC Radio 5 live commentator

    "The crowd inside the Arthur Ashe are stunned. They can't believe their beloved Roger Federer will have to come from two sets down to win. But now they are up and happy after he broke Monfils in the first game of the third set."

  44. Post update

    *Federer 4-6 3-6 2-1 Monfils

    Monfils holding firm, refusing to cave in. Rat-a-tat-tat, take some of that. The Frenchman's serving in this game equally as good as Federer's in the previous one.

  45. Post update

    Federer 4-6 3-6 2-0 Monfils*

    Federer serving like a man who has no doubts and no weaknesses. A hold to love and Monfils wipes his sweaty visage with a towel. The Frenchman knows he will have to battle to win this match.

  46. Federer breaks

    *Federer 4-6 3-6 1-0 Monfils

    Has Federer, even in his recent revived form, got enough in the tank to force this into a five-setter? At 30-30, Federer unleashes a fierce forehand and, unlike in the previous two sets, it hits the target, leaving Monfils swishing at fresh air. Break point Federer. Another vicious forehand and the comeback has begun. Hold on to your hats.

  47. Game and second set

    Federer 4-6 3-6 Monfils*

    Two easy points for Monfils. 0-30. Nervous oohs from the New Yorkers. The Frenchman goes on to amass two set points, wastes one but Federer folds like a deckchair in the wind on the second - netting a forehand.

  48. Post update

    *Federer 4-6 3-5 Monfils

    Trainers screeching... fans sighing... Federer misfiring. The Swiss wastes another opportunity to nick a point from Monfils, the forehand once again his undoing, but a rare error from Monfils and there's a chink of light for Federer at 30-30. But, poor old Roger, he soon realises that it's another dark tunnel ahead of him as Monfils serves with gusto. No chance.

  49. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    Gael Monfils

    "Monfils is totally confusing Roger Federer, he doesn't know if he's going to stay back or come into the net, and no theatrics either tonight," says Brad Gilbert on ESPN. Even the statistics are mildly eye-boggling, with Monfils winning just 59% of the points on his first serve but 77% behind his second serve. However he's doing it, he's getting it done.

  50. Post update

    Federer 4-6 3-4 Monfils*

    A clumsy forehand into the tape from Federer sparks a collective groan from the spectators. At 30-15, Monfils is again knocking on the door but this time there's no way through as Federer's defence is as tough as teak. The five-time champion finishes off with a whipped forehand winner and the focus returns to the Monfils serve.

  51. Post update

    *Federer 4-6 2-4 Monfils

    The second seed could soon be two sets down if Monfils continues to serve with such aplomb. He hasn't given Federer a sniff in this set - another hold to love and the Frenchman extends his advantage.

    Gael Monfils
  52. Post update

    Federer 4-6 2-3 Monfils*

    Federer the mechanic, tinkering under the bonnet, trying to find out why his engine is spluttering, and he comes up with a solution, a slight adjustment here and there and the first serve is firing on all cylinders again. His second ace of the match, mixed in with some unreturnable boomers, for a trouble-free hold.

  53. Post update

    *Federer 4-6 1-3 Monfils

    The physio did eventually trot onto the court to examine Monfils, but the Frenchman's ankle doesn't seem to be troubling him. Federer unable to move the 20th seed around the court because the Frenchman fires four big first serves over the net, giving the Swiss little chance to start a fightback.

  54. Post update

    Federer 4-6 1-2 Monfils*

    The trainer is lurking in the shadows as Federer unleashes one thudding serve after another for a comfortable love hold. The players return to their chairs, but the trainer remains standing on the sidelines. Perhaps he's not needed afterall.

  55. Post update

    Gigi Salmon

    BBC Radio 5 live commentator

    "Here's a stat to make Roger Federer fans cover their ears. In their nine previous meetings, whoever has won the first set has gone on to win the match."

    Gael Monfils
  56. Post update

    *Federer 4-6 0-2 Monfils

    Federer needs to dig deep and put previous miscues and mishits behind him. A slam dunk of an overhead takes Monfils to 30-15, but showmanship from Federer as he sprints to the tape and beats Monfils with a rapsing volley.

    Federer slicing and dicing from the baseline but he comes unstuck, allowing Monfils to proceed to 40-30. But someone has flicked a switch and the second seed's engine is now roaring - an overhead, followed by an angry crosscourt volley and the Swiss has break point. Strange serving tactics from the Frenchman in that last point, but there's nothing wrong with his next howitzer, Federer sticks out an arm but can't return. Danger averted.

    Monfils flat on his back and wincing as he touches his right ankle. The Frenchman twisting his ankle when slapping a forehand into the tape, but he gets back up on his feet and rattles off a quick point to hold.

  57. Get involved at #bbctennis

    Johnson Ogunniyi: "Gael Monfils has been like a box of chocolate in this year."

    Femi Oyedola: "Sleepless in Lee, London, to watch Fed win but it's not looking great early on. He just might need a pep talk from the great Henry."

    John McEnerney: "Fed to win in 4, needs to keep unforced errors count low & no lapses in concentration. Monfils is no pushover, a stern test is what Roger needs!"

    John's on the ball as Monfils takes the first set - what's your prediction? Tweets to #bbctennis

  58. Monfils breaks

    Federer 4-6 0-1 Monfils*

    Federer's first serve continuing to falter, just as it did in the first set, and his forehand isn't yet swinging freely, either. At 15-30 Monfils has a sniff, but the Federer forehand hauls the game to 30-30.

    Monfils' forehand down the line wide by the length of a butterfly's wing. Oohs from the crowd as they watch the replay. Federer off the hook, for now at least.

    The second seed's forehand faltering once more... deuce - advantage - deuce - Wow! Monfils returning the unreturnable but still he loses the point. But the Frenchman earns a break point, comes face-to-face with Federer at the net and outwits the 17-time Grand Slam champion, grabbing his chance thanks to a simple volley.

  59. Game and first set

    *Federer 4-6 Monfils

    No signs of Monfils crumbling under pressure. He collects two set points but, oooh, he double faults. 40-30. Federer wipes his brow with the back of his hand, is the Swiss preparing to pounce? No, not really, not at all. Monfils serves out wide and Federer's response drops into the tramlines. So, there we go. Who would have predicted that?

  60. Post update

    Federer 4-5 Monfils*

    Editor-in-chief of American Vogue Anna Wintour

    Editor-in-chief of American Vogue, Anna Wintour, is a close friend of Roger Federer, but it is his opponent who is currently in vogue. Ten out of 10 for style so for Monfils, but will he fall out of fashion as quickly as a cheap lime green turtle neck? Aggressive from Federer for a comfortable hold but Monfils has a chance to serve for the set.

  61. Post update

    Jill Craybas, US former professional tennis player on BBC Radio 5 live

    "Federer is doing nothing wrong, but Monfils is on fire. He's been a lot more aggressive than in his previous matches and knew he'd have to step up.

    "Monfils has been super aggressive and right now he's making everything. He could easily miss those shots at any moment, he's very streaky like that.

    "Roger won't get as impatient as Grigor Dimitrov did against Monfils in the previous round."

  62. Post update

    *Federer 3-5 Monfils

    Can Monfils continue producing moments of wizardry from his red-hot racquet? At 0-30 he looks to be heading towards a familiar lull but two unreturnable big serves later and he's level at 30-30.

    Federer off key in the big moments, a rash forehand gifts Monfils advantage and the Frenchman follows up with a thunderous forehand which replays show was in by 0.0000001cm. Oof, that was close but close is close enough.

  63. Post update

    Federer 3-4 Monfils*

    Monfils again sows some seeds of doubt at 30-30 and pounces on a disguised Federer drop shot like a panther, hunting down the ball and responding with his own venom and to deuce we go. The Swiss's first serve sees off the danger and there is no more drama to see here.

    Roger Federer
  64. Post update

    *Federer 2-4 Monfils

    Grigor Dimitrov and Richard Gasquet will testify that Monfils has been in inspired form at Flushing Meadows. He has a 100% record on Arthur Ashe and momentum is currently with him. Federer drags his opponent to the net with a drop shot, volleys to send him scrambling backwards and even a man of Monfils' dexterity can do little than direct a backhand into the tramlines. From 30-0 to 30-30 but Monfils consolidates his advantage, securing the hold with a cool ace - his first of the match.

  65. Monfils breaks

    Federer 2-3 Monfils*

    Did anyone order a dose of magic and a touch of oh la la? Fabulous from Monfils - a twist of the hips, a shuffle of the feet - for a unique forehand volley from the baseline which was surely worth the admission fee alone.

    The 20th seed has found his groove and his high-risk gambling is paying off as he has accumulated two break points. Federer holds firm, dragging the game to deuce and saves a third break point with a cute volley at the net.

    Too much adrenaline on the Monfils forehand and Federer has advantage - but Monfils continues to swing free and loose, a looping backhand down the line bounces on the baseline. Wonderful. The Frenchman earns a fourth break point and this time, this time, he does it! Federer wide. Monfils on the march.

    Roger Federer in the first set against Gael Monfils
  66. Post update

    Jill Craybas, US former professional tennis player on BBC Radio 5 live

    "It's very gusty down on Arthur Ashe. It's such a big stadium that it tends to create a bit of a wind tunnel. That makes it difficult to play - especially on the serve.

    "The two players are very different. Roger's very calm and collected on and off the court. Whereas Monfils is defintely the showman - he likes to look like he's tired sometimes, then all of a sudden he'll come back and win. There's lots of drama in his game."

  67. Post update

    *Federer 2-2 Monfils

    John Slattery

    There was Leonardo Di Caprio and Brad Pitt for the quarter-final between Andy Murray and Novak Djokovic and the A-listers have turned up this evening, too. Mad Men actor John Slattery among the 22,000 watching the action on Ashe, although he doesn't look too enthralled. Former Arsenal striker Thierry Henry is also in the crowd. Back to the tennis, Federer again posing questions of the Monfils serve - stealing two points but again the Frenchman just does enough to hold.

  68. Post update

    Federer 2-1 Monfils*

    No joy for Monfils on the Federer serve, a mixture of clean-hitting winners from the Swiss and tame returns from the Frenchman. But Federer does concede his first points on his serve. A hold to 15. The second seed solid.

  69. Post update

    *Federer 1-1 Monfils

    Who is at the other side of the net? Gael Monfils, a player who has reached the last eight without dropping a set and beaten higher seeds Grigor Dimitrov and Richard Gasquet. But it is never easy to predict how the Frenchman will perform and he's up and down in his opening service game.

    Lengthier rallies on the Monfils serve and Federer nicks two easy points for a 0-30 lead but the Frenchman serves his way out of trouble and squeezes to 40-30 with a big boomer down the middle which Federer returns long. But to deuce we go - Monfils launching a forehand long. There's advantage, two break points and in between it all a strange stooping drop shot from the baseline from Monfils. But the Frenchman pulls through, Federer ballooning a forehand at advantage.

  70. Post update

    Federer 1-0 Monfils*

    Roger Federer

    Federer, sporting the Jonny Cash look, top to toe in black, kicks off proceedings. The second seed is three matches from making more history - an 18th Grand Slam title and a sixth at Flushing Meadows.

    Indeed, the 33-year-old is enjoying a revival after a torrid 2013 and playing the sort of tennis John McEnroe describes as "scary". Rapid-fire serving from the Swiss, giving Monfils little chance, and it's a comfortable hold to love.

  71. Federer v Monfils - the last six meetings

    Federer and Monfils have played each other on nine previous occasions, with Federer coming out on top seven times.

    2008 Roland Garros (semi-final) - Roger Federer 6-2 5-7 6-3 7-5

    2009 Roland Garros (quarter-final) Roger Federer 7-6 (6) 6-2 6-4

    2010 ATP World Tour Masters 1000 Paris Hard (semi-final) - Gael Monfils 7-6(7) 6-7(1) 7-6(4)

    2011 Roland Garros (quarter-final) - Roger Federer 6-4 6-3 7-6(3)

    2013 ATP Masters 1000 Shanghai (Round 16) - Gael Monfils 6-4 6-7(5) 6-3

    2014 ATP Masters 1000 Cincinnati (Round 16) - Roger Federer 6-4 4-6 6-3

  72. Monfils in unchartered territory

    Gael Monfils
  73. Gael has top 10 potential - Federer

    Gael Monfils is ranked 24 in the world and is aiming to become the first player ranked outside the Top 20 to reach a US Open semi-final since Mikhail Youzhny, then ranked 54 in the world, did so in 2006.

    But Federer believes the Frenchman has the potential to be a top 10 player. "He's a great mover. He's got a wonderful serve, which nobody talks about because of his athletic movement, which stands out so much," said the Swiss.

    "His issues have been his fitness and the setbacks he's had because of injury, then sometimes maybe not wanting to play because of reasons only he can explain."

    Gael Monfils
  74. Roger on a winning roll

    Roger Federer
  75. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    There are a few bleary eyes around after finishes of 2.26am and 1.17 am over the last two days, but the prospect of Federer v Monfils is sharpening the mind. Federer was out hitting on Ashe with his coach and two-time champion Stefan Edberg earlier, an enticing glimpse of two generations that just missed each other.

    Monfils has been remarkably composed so far in New York, albeit throwing in the odd meltdown along the way. It's a cooler, breezier night, and the general feeling is that even if it's three sets, it will be three fun sets.

  76. Post update

    Hello and welcome to live text commentary to the last quarter-final match of the 2014 US Open, featuring second seed Roger Federer and 20th seed Gael Monfils. The floodlights have been switched on, the majority of fans have filtered through the turnstiles and the players have made their way onto Arthur Ashe Stadium.

  77. Post update

    It's the history man versus the unpredictable man. The artisan versus the acrobat. The man who has won it all versus the man who should have won more. I could go on until sunrise but time is of the essence - there's a tennis match to watch.

    US Open