Open tennis tournament Photogallery

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Roger Federer of Switzerland reacts after his match against Michael Berrer of Germany at the tennis tournament in the western German town of Halle June 11, 2008. (Reuters/Ina Fassbender)

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Serena Williams celebrates after defeating Kaia Kanepi of Estonia 6-3, 6-3 during a fourth-round match at the Sony Ericsson Open tennis tournament in Key Biscayne on March 31, 2008. (AP Photo/Wilfredo Lee)

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Anna Chakvetadze of Russia returns a shot from Sabine Lisicki of Germany during a third-round match at the Sony Ericsson Open tennis tournament on Sunday, March 30, 2008. (AP Photo/Wilfredo Lee)

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Guillermo Canas, of Argentina, returns a shot during a third-round match against Fernando Gonzalez, of Chile, at the Sony Ericsson Open tennis tournament on Sunday, March 30, 2008. (AP Photo/Wilfredo Lee)

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Anna Chakvetadze of Russia returns a shot from Sabine Lisicki of Germany during a third-round match at the Sony Ericsson Open tennis tournament on Sunday, March 30, 2008. (AP Photo/Wilfredo Lee)

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Rafael Nadal, of Spain, celebrates after scoring a point against Benjamin Becker during a second-round match at the Sony Ericsson Open tennis tournament. (AP Photo/Alan Diaz)

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Fernando Gonzalez of Chile signs autographs after defeating Pablo Cuevas of Uruguay during a second-round match at the Sony Ericsson Open tennis tournament in Key Biscayne on Friday, March 28, 2008. (AP Photo/Wilfredo Lee)

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Xavier Malisse of Belgium returns a shot during a second-round match against David Nalbandian of Argentina at the Sony Ericsson Open tennis tournament in Key Biscayne on Friday, March 28, 2008. (AP Photo/Wilfredo Lee)

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David Nalbandian, of Argentina, returns a shot during a second-round match against Xavier Malisse, of Belgium, at the Sony Ericsson Open tennis tournament in Key Biscayne, Fla. Friday, March 28, 2008. (AP Photo/Wilfredo Lee)

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Nicolas Mahut, of France, returns a shot during a second-round match against Carlos Moya, of Spain, at the Sony Ericsson Open tennis tournament in Key Biscayne, Fla., Friday, March 28, 2008. (AP Photo/Wilfredo Lee)