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Summary

  1. Serena Williams beats Ekaterina Makarova 6-1 6-3 in second semi
  2. Defending champion will face Caroline Wozniacki in Sunday's final
  3. Wozniacki won first semi-final after Peng Shaui retired
  4. Peng unable to carry on at 7-6 4-3 down because of heatstroke
  5. Sania Mirza and Bruno Soares win mixed doubles title
  6. Britain's Andy Lapthorne through to wheelchair quad singles final
  7. * denotes next to serve

Live Reporting

By Stephan Shemilt

All times stated are UK

Get involved

  1. Post update

    That is for tomorrow. Tonight belongs to Carolina Wozniacki and Serena Williams. Best buds? There's nothing like a Grand Slam final to test a friendship. Goodnight.

  2. Post update

    But before then, there's the small matter of the men's semis, taking place on a super Saturday in NYC. Novak Djokovic v Kei Nishikori, followed by Roger Federer v Marin Cilic. A Wimbledon final repeat, or will the upstarts crash the party? It kicks off tomorrow from 17:00 BST.

  3. Post update

    Jill Craybas

    Former WTA Tour professional on BBC Radio 5 live sports extra

    "Even after having 17 Grand Slam titles Serena still appreciates every time she is out here. She has such a positive attitude and loves this kind of atmosphere. The criticism she has had this year about her form may be a motivating factor for her."

    Serena Williams, reacts after defeating Ekaterina Makarova, of Russia
  4. Post update

    So, a year on from her last Grand Slam final, Serena Williams is there again. After a disappointing year in the majors, Williams will attempt to tie the 18 Slams of Chris Evert and Martina Navratilova. That's for Sunday, and a battle with her great mate Wozniacki.

  5. Post update

    Serena Williams: "It feels so good. I am so happy. I didn't think I would be here today. I don't know what to say.

    "I know she's so aggressive, so I was really focussed. I just tried to win, I don't know.

    "Playing all summer has given me a lot of confidence. You have no idea what this means to me, I'm really excited.

    "Caroline wants to win and I want to win. Regardless, I'll be happy with the outcome. She's a great girl, we've been looking forward to this since the draw came out. We'll have a lot of fun."

  6. Post update

    Jill Craybas

    Former WTA Tour professional on BBC Radio 5 live sports extra

    "Serena played so well from the start and dominated. She knows Makarova is a good player and that's why she came out so strongly. I just think Makarova could have pushed Serena more from the start."

    USA; Serena Williams, left, shakes hands with Ekaterina Makarova
  7. Game, set and match

    Williams 6-1 6-3 Makarova

    "I am a champion and you're gonna hear me roar" is the song on the public address system. Today, Ekaterina Makarova heard Serena Williams roar. A Makarova backhand wide completes the demolition job and Williams is in to her eighth US Open final. Caroline Wozniacki would have been best off not watching that.

    Serena Williams of the United States celebrates
  8. Post update

    Williams 6-1 5-3 Makarova*

    New York, normal service is resumed. Makarova may be playing her best tennis of the match, but Williams has gears to go through. A backhand to the shoelaces, a Makarova error. It's match point to Williams.

    Serena Williams of the United States reacts
  9. Post update

    Jill Craybas

    Former WTA Tour professional on BBC Radio 5 live sports extra

    "It can happen when you are so far behind that the pressure is off and you can start swinging away and start making a few points. It would have been interesting if she had started the match like this."

  10. Makarova breaks

    Williams 6-1 5-3 Makarova*

    The court covered in clouds, Williams batters down one unreturnable, the punishes the ball with a series of forehands. Hang on, though, what's going on here? Williams wavering, a long backhand giving away a break point. This isn't right? Serena into the net. Makarova breaks. Tell that taxi to wait.

  11. Post update

    *Williams 6-1 5-2 Makarova

    Hmmm, Makarova may be done here. 30-0 up, but a wild forehand and a too-cute drop gets Williams back to 30-30. Nope, the Russian lives on thanks to two Williams net-disturbers. Surely only a delay of the inevitable. Williams to serve for the match.

    Ekaterina Makarova, of Russia, returns a shot
  12. Post update

    Williams 6-1 5-1 Makarova*

    Williams, the most dangerous creature you will ever see in pink leopard print, has the balls on her racquet and the wind at her back. She pulls Makarova from side to side, asking the Russian to chase balls that have already flashed past. Hold to 15 completed with an ace, demolition job almost complete.

  13. Usain Bolt in New York

    Usain Bolt's picture

    Usain Bolt, the fastest man on earth, is watching Serena Williams from the comfort of the players' box. He has tweeted this picture above with the message: Champion in action @SerenaWilliams

  14. Post update

    *Williams 6-1 4-1 Makarova

    At the moment, you'd say Makarova has done well to have nought in this second set. Williams is yet to drop a point on serve and two backhand errors have Makarova 0-30 down. Brief respite, but another Russian error gives Serena two break points. A failed attempt at a one-legged, leaning backhand at least shows Williams is human, with a Makarova bomb of her own clawing it back to 40-40. When Williams goes long, Makarova halts a run of nine games against her with a string of backhands. The Russian is on the board.

  15. Post update

    Williams 6-1 4-0 Makarova*

    Serena Williams

    New York is five hours behind us good folk on BST, so it's just past 17:00 in the Big Apple. Is something good on the telly at 18:00? Repeat of Friends maybe? Williams will get to see it, because this is exhibition stuff now, another run to the net, a tricky put-away, a backhand winner completing a hold to love. Formidable.

  16. Post update

    Jill Craybas

    Former WTA Tour professional on BBC Radio 5 live sports extra

    "Makarova is looking over to her box, throwing her arms up in the air, and looking to her coach because she doesn't know what to do. Serena Williams has played well this tournament but this is the best I have seen her play so far."

  17. Post update

    *Williams 6-1 3-0 Makarova

    Even the sound of ball on racquet is more violent when the strings make contact. Makarova serving, but she may as well be under-arming them over the net. Williams gobbles up the first of two break points. Don't worry Ekaterina, there's perhaps no other woman in the history of the game that could hang in there with Williams in this mood.

  18. Post update

    Williams 6-1 2-0 Makarova*

    There's someone sitting next to the chair umpire (a woman, I think), holding what looks like a camera that stays entirely focused on the flight of the ball. What's that all about? Meanwhile, Williams continues to punish the ball. Ace. 121mph. Casual. Follow that up with another. Hold to love. Put the showers on, they'll be there soon.

  19. Post update

    Jill Craybas

    Former WTA Tour professional on BBC Radio 5 live sports extra

    "Serena has more unforced errors but she also has more winners. That shows she's the aggressor and is taking the game to Makarova. What is amazing is she is so strong but is also so fast around the court."

  20. Williams breaks

    *Williams 6-1 1-0 Makarova

    Into the net this time. Williams breaks at the earliest opportunity, a final place seemingly a case of when, not if.

  21. Post update

    Williams 6-1 Makarova*

    It's almost as if everyone else is being made to hurry up because Williams is in a rush. Already back out for the second set, the right-hand of the court the only part in sunshine, Makarova is instantly under pressure. Long, long, wide. Three break points.

  22. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    "As Flushing Meadows comes to terms with the unexpected end to the first semi-final, Serena Williams has set about the second with every intention of making it a drama-free zone.

    "With her forehand firing on all cylinders, the American has raced through the first set. Williams required treatment to her right foot during the doubles defeat earlier in the week, and although there has been so sign of a recurrence, she is clearly keen to make this as swift as possible."

    Serena Williams, of the United States, walks to the other side of the court
  23. Game and first set

    Williams 6-1 Makarova

    That'll do. Makarova is feeling the full force of a New York wind called Hurricane Serena. Only 26 minutes for Williams to move halfway to the US Open final. It's hard to see how the second set will follow a different course.

    Serena Williams of the U.S. celebrates a point
  24. Post update

    *Williams 5-1 Makarova

    Bounce ball. Throw ball. Hit ball very hard. Repeat. The Williams mantra. Makarova, the cannon fodder, does all she can to return fire, but a stand-and-deliver backhand brings up two set points. Awesome.

  25. Post update

    Jill Craybas

    Former WTA Tour professional on BBC Radio 5 live sports extra

    "Makarova is not serving well. She needs to get her first serve percentage up because Serena is getting too many second serves and she's taking advantage."

  26. Post update

    *Williams 5-1 Makarova

    From here, it's got the potential to get messy. Makarova is being pushed into submission by the grenades being lobbed from the other side of the net. The Russian is struggling to keep the ball in the court, but it's because of the Serena onslaught. Two break points, one saved when Williams nets. No mistake second time round, though. Makarova long, Williams serving for the set.

  27. Post update

    Williams 4-1 Makarova*

    Williams is a light-footed battering ram, asking Makarova to scamper all over. Sister Venus looks on as Williams, impressive mane tied back, errs for 30-30. A chink for Makarova? A little, aided by a Williams double that takes us to 40-40. Happy, Serena? Maybe not, but the chuntering at her chair is at least on the back of two forehand winners for a 4-1 lead.

  28. Williams breaks

    *Williams 3-1 Makarova

    An exchange between Williams and the umpire results in an unsuccessful Williams challenge, but that is forgotten when Makarova goes long. Williams breaks. Ominous.

    Serena Williams of the United States reacts
  29. Post update

    Williams 2-1 Makarova*

    Williams, a decade and a half on from her first US crown, wiggles as she waits for the Makarova serve in very strong winds. Makarova, serving with the wind for the first time, goes long and then nets, before a Williams forehand from an impossible angle opens up 15-40 and two break points.

  30. Post update

    Williams 2-1 Makarova*

    Ekaterina Makarova of Russia returns

    It's been said that Makarova has a look of Steffi Graf. I'm not sure I see it, other than she is tall and blonde. The Russian is looking to delay Williams, who is into the groove of belting the forehand and now a first ace of the match. One more groundshaking forehand sends us to the chairs.

  31. Post update

    *Williams 1-1 Makarova

    Chants of support for Makarova as she switches ends, serving from beneath a white visor. Williams, pink leopard print, sways from side to side, and is on the receiving end of some Russian hitting before she batters a forehand return. 40-30, but the Williams forehand for once lets her down to get Makarova on the board.

  32. Post update

    Williams 1-0 Makarova*

    Serena Williams

    Ekaterina, meet Serena's forehand. You may be well acquainted before this day is done. Makarova, the leftie, at least serves notice of what she is capable of with a double-handed backhand winner, but it's a comfortable hold for Williams.

  33. Post update

    *Williams 0-0 Makarova

    "Time," is the call from the chair, with Williams biffing down one more serve before returning to her chair for a stripping of the jacket. Makarova reties her laces and towels down before heading off to the far end, where the wind will be behind her. Williams will serve.

  34. Post update

    The players are on court, Makarova in Wimbledon white and Williams in a black jacket over a pink dress. You read that right, a jacket. As if we're at a black-tie event.

  35. Post update

    I'm glad you mentioned the doubles, Serena, because they provide Makarova with a little encouragement. With her partner Elena Vesnina, Makarova brushed aside Serena and sister Venus in the quarter-finals of the women's doubles in straight sets.

  36. Post update

    Perhaps, but Williams hasn't had the best of years at the Slams - the fourth round at the Australian Open her best performance.

    Not that she's worried.

    "It's so easy now because it's almost a joke for me because I have done little to no winning in the majors," she said. "And I thought, 'Take it as a joke. Oh my God, I'm past the fourth round. Woo'. I'd better play doubles just in case I don't make it past the second round. At least I have a back-up plan."

  37. Post update

    Does Serena Williams need an introduction? 17 Grand Slams, five US Opens, the defending champion, no sets dropped on the way to a meeting with the 17th-seeded Russian Ekaterina Makarova, who has never before reached a semi-final at the majors.

    No contest?

  38. Post update

    After that drama it's now time to turn our focus to the second semi-final and coming up next Serena Williams, the defending champion, takes on Ekaterina Makarova. Wonder if they are aware of what's been going on?

  39. Post update

    David Law

    BBC Radio 5 live sports extra commentator

    Caroline Wozniacki of Denmark (R) checks on Peng Shuai

    "It's distressing to see players in such physical discomfort and it would have been sensible, if it's in the rules, for someone to have stopped the match. I think tennis need to look at that."

  40. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "You feel like it's not a victory but Caroline did everything she had to do to win the match. It was really sad to watch and you never want to see someone go out like that."

  41. Get involved

    #bbctennis

    Danny Morgan: Devastating end but Wozniacki is on a mission. She beats Serena in an epic 3 setter tomorrow.

  42. Post update

    Peng Shuai leaves court

    You hope it's only a temporary problem for Peng, rather than something more long-term. It looked like her body began to cramp, first in her legs, then her shoulders. It's quite distressing to see an athlete taken away in a wheelchair.

  43. Post update

    Caroline Wozniacki: "It was very difficult to watch. You want to battle and finish it properly. I feel sorry for Peng because she played really well. I hope she'll be OK.

    "I feel pretty good. I've been in bed for the past two days, but I feel good now. The crowd was amazing, cheering me through.

    "It's incredible to be in the final, I have goosebumps. I'll go to have an ice bath, then watch the other semi."

  44. Game, set and match

    Wozniacki 7-6 (7-1) 4-3 Peng - Peng retires

    A sad, but inevitable end. Caroline Wozniacki has won this match and is through to the US Open final, but concern is for Peng Shuai, who looks to be going in to a full-body cramp. She is helped into a wheelchair and taken from the court, applauded by the crowd and Wozniacki.

  45. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Wozniacki is feeling this. It's like the boxer who doesn't want to hit the guy because he's done."

  46. Post update

    *Wozniacki 7-6 (7-1) 4-3 Peng

    Peng Shuai of China drops to the court in pain

    That serving practice has done Wozniacki some good, the ball landing to save the break point. Hang on, what's going on here? Return winner from Peng, then, unbelievably, another double from Wozniacki gives Peng one more break point. Barely able to move, Peng goes long and goes to her knees once more, with an unreturned serve leaving Peng on all fours on the ground. Now, Wozniacki is checking on her stricken opponent.

  47. Peng returns to court

    *Wozniacki 7-6 (7-1) 4-3 (30-40) Peng

    We've gone 10 minutes since the last point. The medical timeout is over. Here comes Peng Shuai. She looks emotional, but, remember, she's got a break point...

  48. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    "Peng leaves for medical "evaluation" before it's announced as an official medical timeout. "If she evaluates for half an hour, everyone could be ready again," says Wozniacki. Confusion on and around Arthur Ashe Stadium."

  49. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    Peng Shuai

    "I don't think Peng will be able to continue. They are taking precautions and giving her the chance, but I think it was so severe I think she will say she can't walk back on to court."

  50. Medical timeout

    *Wozniacki 7-6 (7-1) 4-3 (30-40) Peng

    Wozniacki looks to be getting a little antsy, questioning the chair umpire. She goes back to the serves - if she's not careful, she'll need treatment on her shoulder. Now it's time for a sit down and a drink, then wait. Peng is out of sight, while music plays over the tannoy.

  51. Peng leaves court for treatment

    *Wozniacki 7-6 (7-1) 4-3 (30-40) Peng

    In case you were wondering, Wozniacki is still netting those serves. The umpire tells us that Peng is being evaluated by the doctor. The busiest people on court are the ball-boys, as three of them have to relay balls back to Wozniacki.

  52. Post update

    *Wozniacki 7-6 (7-1) 4-3 (30-40) Peng

    Still Wozniacki practises as Peng is helped to her chair. Is this the end of the match? What a sad end if it is. The ball-boy brings an umbrella to shelter Peng while Wozniacki asks what is going on. There's people all over the court while the Dane continues to serve to no one. Strange scenes.

  53. Post update

    *Wozniacki 7-6 (7-1) 4-3 (30-40) Peng

    Peng Shuai

    Is that right, is Wozniacki crying? The referee is out there. Peng is at the back of the court, leaning on the boards. What was thought to be cramp looks like a right knee problem. Now it's the Chinese in tears as Wozniacki practises her serve. Bizarre drama.

  54. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Wozniacki is crying because it's disturbing her so much. She just rubbed her eye. It's emotional. About 99% of cramp occurs because of nerves and because a player wants this so much."

  55. Physio on court to help Peng

    *Wozniacki 7-6 (7-1) 4-3 (30-40) Peng

    Wozniacki has the wind behind her as shadows gradually begin to creep across the court, but she shows her frustration in the shape of a right foot aimed at the ball as yet another double fault gives Peng a 15-30 lead. "Come on," says Wozniacki as she gets back on terms, with Peng then hopping around because of cramp in her right thigh. The crowd applaud encouragement. Just land the serve, right, Caroline? You can't believe this. Double fault. Peng still hobbling, barely able to stand. Here comes the physio...

  56. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    Caroline Wozniacki, of Denmark, takes a break between games

    "Wozniacki is thinking it doesn't matter if she's serving or returning, it's eight points to win and reach the final. She only needs to think about that."

  57. Post update

    *Wozniacki 7-6 (7-1) 4-3 Peng

    Peng isn't going quietly, though, reminding Wozniacki that there's still work to do with a big double-hander that has the Dane floundering. Ah, this won't do. Two backhands landing wide, 40-40. Under pressure, Peng responds, battering home a smash, then serving an unreturnable. No gimmes for Wozniacki.

  58. Post update

    Wozniacki 7-6 (7-1) 4-2 Peng*

    The rapid fire of camera shutters click as Wozniacki tosses the ball into the blue New York sky. Peng's forehand not coping well, though a seventh double fault from the Dane brings us back to 40-30. Once more, though, the Peng forehand can't do the business, and a dump into the net puts Wozniacki one step closer.

  59. Wozniacki breaks

    *Wozniacki 7-6 (7-1) 3-2 Peng

    Caroline Wozniacki

    Is that the ball game? Wozniacki gobbles up the Peng serve for her third game in a row and a break advantage. The 10th seed hasn't been a great leader, but she's now only three games from the final. She removes her ice towel and heads back on to court. She may only feel its cool fluffiness once more.

  60. Post update

    Wozniacki 7-6 (7-1) 2-2 Peng*

    Peng is showing the odd sign of cracking, leaning on her knees as a forehand goes wide. More frustration, giving another forehand too much welly. 0-30. Hmmmm. Is it falling apart? Double fault. Three break points.

  61. Post update

    Wozniacki 7-6 (7-1) 2-2 Peng*

    From 60%, down to 50%, a third break point gone. In Peng's defence, it's a brutal Wozniacki forehand that saves it, with Peng then going long with a forehand of her own. An important Wozniacki hold is completed when Peng goes into the net, getting us back on serve in the second.

  62. Post update

    *Wozniacki 7-6 (7-1) 1-2 Peng

    If Peng goes on to lose this, she might reflect on missed opportunities. Wozniacki has taken all three of her break opportunities, while Peng has taken only three of five. 60% is decent, but not good enough when your opponent is up at 100%. Wozniacki, though, is presenting another chance to the Chinese. Double fault. Break point number two.

  63. Post update

    *Wozniacki 7-6 (7-1) 1-2 Peng

    Caroline Wozniacki

    Those drunken singers have got Sweet Caroline stuck in my head. For what seems like the umpteenth time in the match, the ball is given some huge hang time in a marathon rally, Peng eventually going wide with a forehand. The Dane follows up with an ace, but is totally stunned by a a Peng reaction volley. That ball was rifled at the Chinese, but the doubles specialist somehow got it back. Wozniacki can't get there and gives away another break point with a wild forehand.

  64. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Don't start thinking about the ramifications of winning this match because that's when you go into a tailspin. It goes against human nature but you have to do it."

  65. Wozniacki breaks

    *Wozniacki 7-6 (7-1) 1-2 Peng

    Peng has just never looked comfortable in the lead, while Wozniacki comes to the fore when she's forced to chase. A forehand in the fish-catcher means Peng surrenders the break she earned in the previous game. Back on serve in the second.

  66. Post update

    Wozniacki 7-6 (7-1) 0-2 Peng*

    All happening. Wozniacki looks to take Peng's head off, only for a stabbed volley to limp over the net. Ultimately, though, Peng's scampering isn't enough to prevent 30-30 and a double fault give Wozniacki the chance to break back...

  67. Get involved

    Arthur Ashe

    Gael Monfils, who lost to Roger Federer in five sets on Thursday, on Twitter: I will keep working harder to maybe have one day my picture next to my idol. A big thx to all my fans.

  68. Peng breaks

    Wozniacki 7-6 (7-1) 0-2 Peng*

    So often in this match, Wozniacki has been at her best with her back pressed against the Big Apple. She's scrapping here, only for the forehand to break down once more. Wild and wide, Peng tacking an early break in the second.

  69. Post update

    *Wozniacki 7-6 (7-1) 0-1 Peng

    Jeff Tarango's view is probably a popular one - you'd suspect Wozniacki could pull away. No one seems to have told Peng Shuai, though. Twice she forces Wozniacki errors for 15-30. Jolted into life, Wozniacki urges her long legs to the net to pass, only to be left static when Peng blast a backhand past for a break point...

  70. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Wozniacki will be looking to roll through this second set. I don't see any way Peng can raise her game to stop her now."

  71. Post update

    *Wozniacki 7-6 (7-1) 0-1 Peng

    Peng Shuai serves

    Peng, jet black hair in a neat ponytail, is booming down the serves to little fanfare. Two not returned, with her first ace sandwiched in between. The crowd are non-plussed, though, barely any applause to appreciate her efforts. Is that someone singing Sweet Caroline? Come on, we can do better than that.

  72. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    "There's not much doubt who the crowd are favouring, with plenty of "C'mon Caroline!" to be heard as this enormodrome slowly fills up - best guess is about two thirds or 15,000 in now, which is about what Centre Court holds.

    "Peng had won 40 service games in a row before Wozniacki broke through in that set, and the Dane edged it despite struggling with the wind."

  73. Post update

    Wozniacki 7-6 (7-1) Peng*

    Shots of the outside courts show Roger Federer chatting with Kei Nishikori. "Listen Kei, this is how you beat Novak." The players are back, Wozniacki complete with ice towel. She rises from her seat first and will be on the receiving end of the Peng serve.

  74. Post update

    David Law

    BBC Radio 5 live sports extra commentator

    "Wozniacki's defence has been magnificent. She has dealt with everything Peng has thrown at her and it looked for the first time during that tie-break as if the effort was getting too much for Peng."

  75. Game and first set

    Wozniacki 7-6 (7-1) Peng

    One is all she needs. From Peng Shaui serving for the first set, Caroline Wozniacki has turned it around to race through the tie-break. Peng is a set down for the first time in the tournament, while Wozniacki is one step closer to the final. Both head off court at the end of a very watchable opening chapter.

  76. Post update

    *Wozniacki 6-6 (6-1) Peng

    Yep, it's turning into a procession. Woznicaki changes ends at 5-1, then, playing with great freedom, earns five set points.

  77. Tie-break

    Wozniacki 6-6 (4-1) Peng*

    Caroline Wozniacki

    Peng is creaking here, looking quizzically at her racquet as if it is the strings that are letting her down. Wozniacki, all flowing forehands and slicey backhands, has been at her best since Peng served for the set. The Dane leads 4-1.

  78. Tie-break

    *Wozniacki 6-6 (2-1) Peng

    Peng immediately earns a mini-break thanks to a Danish error, then is engaged in an age-long battle of attrition. Back and forth, ball sent skywards, coming down with snow on. Wozniacki puts away the smash, then forces Peng to net. No points won on serve yet in this breaker.

  79. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Wozniacki doesn't quit. She's a great fighter, even when she was not playing well or as fit as she has been, she was still a great fighter."

  80. Wozniacki breaks

    *Wozniacki 6-6 Peng

    We're going all the way. Peng's backhand completely lets her down, meaning we need the shootout. No time to draw breath.

  81. Post update

    Wozniacki 5-6 Peng*

    The sun is fully behind a cloud as Wozniacki nets to spark a Peng fist pump. 15-0, but the bouncing Wozniacki is scrapping, a backhand and two Peng errors putting her in charge. 15-40, two break points, two points from a tie-break....

  82. Peng breaks

    Wozniacki 5-6 Peng*

    Caroline Wozniacki and Peng Shuai

    Where did I put my upset claxon? Peng breaks at the last possible opportunity and will serve for the first set. The backhand volley isn't good enough from Wozniacki, putting the Chinese ahead.

  83. Post update

    *Wozniacki 5-5 Peng

    The peach number that Wozniacki is wearing has a darker half that gives an unflattering illusion in the underarm region, if you know what I mean. Serving away from us as we watch, white visor to white visor, she is asked to defend defiantly for what seems like an age. In comes Peng, deft drop, Wozniacki not quite quick enough. 30-30. When the forehand yet agin lets her down, Wozniacki faces break point...

  84. Get involved - #bbctennis

    Who are sport's best friends?

    Toniwater: Michael Jordan & Tiger Woods, James Hunt & Barry Sheene, Dwight Yorke & Brian Lara, Beefy & Viv Richards, Chris E & Martina N!

  85. Post update

    *Wozniacki 5-5 Peng

    Is it possible for the temperature to be cranked up? It's 28 degrees as it is. Either way, we're seeing some big ball-striking, a winner getting Peng ahead, with Wozniacki unable to control a forehand for 40-15. When Wozniacki drifts long once more, we're sent to overtime.

  86. Post update

    Wozniacki 5-4 (15-0) Peng*

    What a rally! Brutal, line-hunting stuff. 28 shots, the longest of the match so far. Ooohs and aaahs, Wozniacki defending until Peng nets. All that for 0-15...

  87. Post update

    Wozniacki 5-4 Peng*

    Caroline Wozniacki of Denmark serves

    You wonder how many chances Peng will get, so wasting them isn't clever. Long with a forehand, twice, to allow Wozniacki back to pole position. Heavy breathing, a bounce or two of the ball, persuading Peng to go long once more. A hold by the skin of her teeth, Peng must serve to stay in the set.

  88. Post update

    *Wozniacki 4-4 Peng

    That's not settled the 10th seed, though, who allows Peng back to 30-30 with her fourth double fault of the match. Ooofff, Wozniacki was for the taking there, but Peng dumped a double-hander into the net. This time the Chinese gets it right and the fist pump tells us we're at 40-40. From no sign of a break, we've had two and the Wozniacki serve is again being pressured. Pressure? Yet another double fault. Break point.

  89. Game, set and match

    Britain's Andy Lapthorne has reached the final of the wheelchair quad singles after winning his second round-robin match in straight sets against Lucas Sithole.

    He will attempt to win his first ever Grand Slam singles title on Sunday.

  90. Wozniacki breaks

    *Wozniacki 4-4 Peng

    ...a ridiculous rally. Both players pushed way back, the ball at times lobbed over as if being patted around by a couple of club players. Wozniacki's patience is rewarded as Peng goes long, meaning we're all-square again. All together now..."it's only a break if you hold afterwards".

  91. Post update

    Wozniacki 3-4 Peng*

    Peng behind looking to follow up the break in the biggest match of her life. Once more a cloud rolls over as Wozniacki plays her best forehand so far, hunting the corner and leaving Peng trailing. 0-30. Peng has Wozniacki stretching, but a trip to the tramlines gives gives Wozniacki two break-back points...

  92. Get involved - #bbctennis

    Who are sport's best friends?

    John McEnerney: Martina & Pam Shriver, John Mc & Flemming, the Gulicksons, Vincent O'Brien & Piggot, Cloughie & Taylor, Toshack & Keegan!

  93. Peng breaks

    Wozniacki 3-4 Peng*

    Peng Shuai

    Wozniacki is being challenged by Peng, who takes two long rallies, first with a backhand winner, then a loose Wozniacki backhand. Two break points. Peng again engages Wozniacki, who frailties on the forehand surface with a wild shank. We have a break, and it's gone to the underdog.

  94. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Both ladies are doing a good job of holding serve. We've seen a lot of breaks in other matches, in both men's and women's matches, but this set is very much commanded by serve."

  95. Post update

    *Wozniacki 3-3 Peng

    That breeze to which my man Piers refers has the Stars and Stripes blowing with gusto high above the court. The sun, though, just dips behind a cloud as a pair of Peng errors allow Wozniacki back to 30-30. The Dane bounces, fiddles with the strings, but flashes a stare at her box when a forehand takes a trip to the net. A Peng backhand wraps it up. Still no sniff of a break point.

  96. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    "The temperature gauge is sticking with 28C but it feels a lot hotter on Ashe right now, with the gusting breeze very welcome - for the spectators at least. Wozniacki's father, Piotr, surveys the scene from behind dark glasses, doubtless frustrated that there is no on-court coaching allowed at Slams. He is the master of that domain."

  97. Post update

    Wozniacki 3-2 Peng*

    Caroline Wozniacki

    Sweat glistens on the arms of Wozniacki as she gets the better of a baseline exchange. Polite applause, but much louder when Peng charges for a backhand and 30-30. They're getting stuck in to these rallies now, the ball getting the treatment from corner to corner. Wozniacki, though, lets a third double in for 40-40. What was I saying about the ball getting battered? Wozniacki smashes to Manhattan then leaves Peng static with a backhand to hold.

  98. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Wozniacki has also improved her first serve, her strength and her fitness. She is in much better shape than a year or two years ago. She has re-dedicated herself to tennis and has changed her racquet back to the one she had when she was world number one. I am proud of her for doing all that and coming through all the troubles she's had this year."

  99. Post update

    *Wozniacki 2-2 Peng

    Peng is no stranger to the latter stages of the Slams, it's just being on her own that is a new concept. She holds the French Open doubles title and won Wimbledon last year. With the shadow of the umpire's chair creeping on to the blue rectangle that is the court, Wozniacki gets the better of a volley exchange before Peng has her on the run. A stunning backhand and a delightful drop get the job done to 15.

  100. Post update

    Jeff Tarango

    Former professional tennis player on BBC Radio 5 live sports extra

    "Wozniacki is very consistent and is doing a very good job of oscillating the ball from side to side. Peng can hit the ball so hard that Wozniacki doesn't want to set her up. It's a good tactic."

  101. Post update

    Wozniacki 2-1 Peng*

    Despite that spell at the top of the world rankings, Wozniacki has only ever reached one previous Grand Slam final, at this tournament in 2009 when she was beaten by Kim Clijsters. In the longest rally of the match so far, Wozniacki turns defence into attack and puts away a volley at the net, but the advancing Peng shows aggression of her own for 30-30. Danger for the Dane, averted with a remarkable squatting forehand (played from the crouching position of a wicketkeeper) and a kicking ace.

  102. Post update

    *Wozniacki 1-1 Peng

    Peng Shuai

    A quick change, Peng serving from the far end as we look on. In six previous meetings, Peng has beaten Wozniacki only once and allows the Dane back to 40-40 with a long forehand. A first sign of trouble, but negotiated with a deep backhand and a Wozniacki dump into the net.

  103. Post update

    Wozniacki 1-0 Peng*

    Wozniacki, platted long blonde hair, belts down an early ace, but follows that with a sloppy double. The 10th seed, though, is looking confident, asking Peng to chase a forehand then having the Chinese fail with a return. Good hold.

  104. Post update

    The players have taken to the court and are going through that very curious tennis version of a warm-up - the knock-up. Wozniacki has shed a frilly pink tracksuit top to reveal a peach, while Peng is in a pink number of her own. There's still plenty of empty blue seats as the umpire calls time, with the Dane first to emerge from her chair. She'll have the balls first.

  105. Post update

    BBC Radio 5 live sports extra

    And, while you're mulling that one over, you may want to supplement your enjoyment of this informative and entertaining live text with an audio accompaniment. You can listen to live commentary from Flushing Meadows on BBC Radio 5 live sports extra, here online, on digital TVs and via the BBC Sport and BBC Radio apps.

  106. Get involved

    So, on another scorching Big Apple day, that is our immediate concern. Peng v Wozniacki for the right to meet either Williams or Makarova. The question is simple. Who do you think will reach the final? Are we set for a Willniacki demolition job, or will Peng and Makarova cause chaos in Queens? Text 81111, tweet using the hashtag #bbctennis, or get involved on the BBC Sport Facebook page.

    If that question isn't floating your boat, ponder this. Who are sport's best friends? The inseparables? Woodbridge and Woodforde? Ballesteros and Olazabal? Redgrave and Pinsent? Kevin Pietersen and Andrew Strauss? You get my drift.

  107. Post update

    Piers Newbery

    BBC Sport at Flushing Meadows

    Sania Mirza, left, and Bruno Soares

    "It's a very muggy 28C and another blowy day at Flushing Meadows, with the flags flapping furiously as Bruno Soares and Sania Mirza receive their trophy for winning the mixed doubles.

    "The Arthur Ashe Stadium is an oasis of calm compared to yesterday evening when Roger Federer beat Gael Monfils in a match so exciting it even got a mention on the US sports news, albeit after lengthy discussion of last night's opening NFL match (the Seahawks won).

    "Caroline Wozniacki and Serena Williams have been making the headlines on the women's side of the US Open, with the good friends favoured to make it through to the final today."

  108. Post update

    In a tournament of upsets, Peng has proved to be most adept at making the big girls cry. Agnieszka Radwanska (seeded four), Roberta Vinci (28) and Lucie Safarova (14) have all fallen to the 28-year-old world number 39, who has never won at Tour level.

    Wozniacki has had her share of tests too, not least a three-set stonker against Maria Sharapova in the last 16. The bottom line, though, is that the former world number one, now Roryless, is through to her first Grand Slam semi for three years.

  109. Post update

    Peng Shuai and Ekaterina Makarova (whose friendship status is unknown) will have a thing or two to say about that potential final love-in, though.

    It is they who stand in the respective paths, with unseeded Chinese Peng, in her first Grand Slam semi, up first against Wozniacki.

  110. Post update

    See, Oscar's words could be very relevant to the 2014 US Open. When Caroline Wozniacki was down in the dumps following her split from Rory McIlroy, she was cheered up by her BFF Serena Williams.

    That was a Miami beach in June, this is the last four of a New York Grand Slam in September, where they are each one win away from a final meeting - sympathising with a friend's success and all that.

    Serena Williams and Caroline Wozniacki
  111. Post update

    "Anybody can sympathise with the sufferings of a friend, but it requires a very fine nature to sympathise with a friend's success."

    I wonder if Oscar Wilde liked tennis.