Results on Wednesday, Sep 3

Men:Quarter-finalsAndy Murray (GBR x6) bt Juan Martin Del Potro (ARG x17) 7-6 (7/2), 7-6 (7/1), 4-6, 7-5Rafael Nadal (ESP x1) bt Mardy Fish (USA) 3-6, 6-1, 6-4, 6-2Women: Quarter-finalsDinara Safina (RUS x6) bt Flavia Pennetta (ITA x16) 6-2, 6-3Serena Williams (USA x4) bt Venus Williams (USA x7) 7-6 (8/6), 7-6 (9/7)Women's doubles: Quarter-finalsAnabel Medina Garrigues-Virginia Ruano Pascua (ESP/ESP x5) bt Raquel Kops-Jones-Abigail Spears (USA) 2-6, 6-3, 7-6 (7/2)Cara Black-Liezel Huber (ZIM/USA x1) bt Yan Zi/Zheng Jie (CHN x8) 6-4, 6-3

Results on Wednesday from the US Open tennis championships (x denotes seed):

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Men:Quarter-finals
Andy Murray (GBR x6) bt Juan Martin Del Potro (ARG x17) 7-6 (7/2), 7-6 (7/1), 4-6, 7-5
Rafael Nadal (ESP x1) bt Mardy Fish (USA) 3-6, 6-1, 6-4, 6-2

Women: Quarter-finals
Dinara Safina (RUS x6) bt Flavia Pennetta (ITA x16) 6-2, 6-3
Serena Williams (USA x4) bt Venus Williams (USA x7) 7-6 (8/6), 7-6 (9/7)

Women's doubles: Quarter-finals
Anabel Medina Garrigues-Virginia Ruano Pascua (ESP/ESP x5) bt Raquel Kops-Jones-Abigail Spears (USA) 2-6, 6-3, 7-6 (7/2)
Cara Black-Liezel Huber (ZIM/USA x1) bt Yan Zi/Zheng Jie (CHN x8) 6-4, 6-3

Men's doubles: Semi-finals
Lukas Dlouhy-Leander Paes (CZE/IND x7) bt Maximo Gonzalez-Juan Monaco (ARG) 6-2, 6-0
Bob Bryan-Mike Bryan (USA x2) bt Tommy Robredo-Sergio Roitman (ESP/ARG) 6-2, 6-1