Day 11 of the US Open gets started under cloudy New York skies, but Venus and Serena Williams are in doubles action and the sisters win the first set of their semi-final against Alisa Kleybanova and Ekaterina Makarova
British number two Laura Robson is in action on Court Eight, taking on 12th seed Tamaryn Hendler of Belgium in round three of the girls' singles
Venus and Serena struggle to find their best form and drop the second set, but the experienced Americans, seeded fourth, come through to beat Kleybanova and Makarova 7-6 (7-5) 3-6 6-2 and reach the final
Defending mixed doubles champions Cara Black and Leander Paes are expected to retain their title against the unseeded American pairing of Carly Gullickson and Travis Parrott
Robson is broken by Hendler in game one of the opening set but recovers to dominate her Belgian opponent and win 6-2 6-1 in 72 minutes. The 15-year-old will play American Lauren Davis for a place in the semi-finals
Parrott and Gullickson only gained entry to the tournament via a wildcard, and Gullickson had never before played mixed doubles at a Grand Slam, but they dominate second seeds Paes and Black to win 6-2 6-4
Following Robson on Court Eight is British number one Heather Watson. The 17-year-old from Guernsey races into a 5-0 lead but lets German opponent Annika Beck come back to 4-5 before taking the first set
Assessing the British girls' progress on Court Eight is the veteran newsreader Sir Trevor McDonald (left)
Watson experiences an almost carbon-copy second set, letting slip a 5-1 lead, but rallies late on to secure a quarter-final place with a 6-4 7-5 victory over Beck
Surprise semi-finalist Yanina Wickmayer of Belgium is asked for a natural pose as she does her media duties ahead of Friday's match against Caroline Wozniacki
The men's quarter-finals continue with sixth seed Juan Martin del Potro making a bad start against Marin Cilic, conqueror of Andy Murray
Cilic continues where he left off against Murray as his big serve and heavy forehand help him lead by a set and a break
Del Potro is the more experienced of the two 20-year-olds, having reached the French Open semis, and he steadily works his way back into the match
Cilic cannot respond and Del Potro powers through to a 4-6 6-3 6-2 6-1 win in 152 minutes, and the Argentine awaits Rafael Nadal or Fernando Gonzalez in the semis
Nadal takes on Gonzalez in the night session, with the Spaniard hoping to cope with the abdominal problem that has been bothering him in New York
Greg Norman, Chris Evert and Pam Shriver are among those in Arthur Ashe Stadium enjoying the last of the men's quarter-finals
Gonzalez gets the first chance of a breakthrough with two set points in game 12 but he cannot convert, and Nadal takes the tie-break
Despite playing superbly to win the first set, Nadal still calls for the trainer as his abdominal injury continues to be a problem
Rain had been predicted all day and it finally arrives at Flushing Meadows early in the second set
After a brief wait on court, Nadal heads to the locker room and the chance to get some attention to his injury
Play resumes after a 75-minute delay and Gonzalez is soon under pressure but saves two set points to force another tie-break
The rain returns with Nadal leading 7-6 (7-3) 6-6 (3-2) and Gonzalez about to serve in the tie-break
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