The U.S. Open

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Michael Thompson finished with seven birdies and three bogeys in his opening-round, 4-under-par 66 in the U.S. Open at Olympic Club in San Francisco. (Associated Press)

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Michael Tobiason, Jr., of Wilmington, Del., takes a shot from the sand trap on the first fairway during the U.S. Open qualifier at the Woodmont Country Club in Rockville, Md., Monday, June 4, 2012. (Rod Lamkey Jr/The Washington Times)

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Serena Williams talks to the chair umpire Eva Asderaki during the women's championship match against Samantha Stosur of Australia at the U.S. Open tennis tournament in New York, Sunday, Sept. 11, 2011. (AP Photo/Mike Groll)

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Samantha Stosur, of Australia, poses with the championship trophy after beating Serena Williams at the U.S. Open in New York on Sunday, Sept. 11, 2011. (AP Photo/Charles Krupa)

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Novak Djokovic reacts after ousting Roger Federer in the U.S. Open semifinals Saturday and improving to 63-2 in 2011. (Associated Press)

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Serena Williams reacts after winning her semifinal match against Caroline Wozniacki of Denmark at the U.S. Open in New York on Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)

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Rafael Nadal of Spain reacts after winning a semifinal match against Andy Murray of Britain at the U.S. Open in New York on Saturday, Sept. 10, 2011. (AP Photo/Charlie Riedel)

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Novak Djokovic reacts after winning a semifinal match against Roger Federer at the U.S. Open tennis tournament in New York on Saturday, Sept. 10, 2011. (AP Photo/Charles Krupa)

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Rafael Nadal of Spain hits a ball into the stands after winning a quarterfinal match against Andy Roddick at the U.S. Open tennis tournament in New York, Friday, Sept. 9, 2011. (AP Photo/Matt Slocum)

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ASSOCIATED PRESS An officer stands watch at an entrance to the U.S. Open in New York. Extra precautions are being taken at sports events Sunday, the 10th anniversary of the 9/11 attacks.

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Caroline Wozniacki, of Denmark, returns to Svetlana Kuznetsova, of Russia, in the fourth round of the U.S. Open tennis tournament, Monday, Sept. 5, 2011, in New York. (AP Photo/Elise Amendola)

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Serena Williams reacts during her match against Ana Ivanovic of Serbia during the U.S. Open tennis tournament in New York, Monday, Sept. 5, 2011. (AP Photo/Mel Evans)

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ASSOCIATED PRESS Rafael Nadal, the No. 2 seed, dispatched David Nalbandian in straight sets before experiencing a severe leg cramp during Sunday's action at the U.S. Open. He reacted to the pain (below) during his post-match news conference.

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Andy Roddick, of the United States, acknowledges the crowd after defeating Jack Sock, also of the United States, 6-3, 6-3, 6-4 during the U.S. Open tennis tournament in New York, Friday, Sept. 2, 2011. (AP Photo/Charles Krupa)

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Venus Williams, of the United States, returns against Vesna Dolonts, of Russia, during the first round of the U.S. Open tennis tournament in New York, Monday, Aug. 29, 2011. (AP Photo/Charles Krupa)

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ASSOCIATED PRESS Venus Williams defeated Vesna Dolonts 6-4, 6-3 in the first round of the U.S. Open and was supposed to face 22nd-seeded Sabine Lisicki on Wednesday.

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Venus Williams, of the United States, returns against Vesna Dolonts, of Russia, during the first round of the U.S. Open tennis tournament in New York, Monday, Aug. 29, 2011. (AP Photo/Charles Krupa)