Serena Williams

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Serena Williams, of the United States, attends a press conference ahead of her participation to the Italian Open tennis tournament, in Rome, Monday, May 12, 2014. (AP Photo/Riccardo De Luca)

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Serena Williams, of the United States, arrives for a press conference ahead of her participation at the Italian Open tennis tournament, in Rome, Monday, May 12, 2014. (AP Photo/Riccardo De Luca)

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Serena Williams from the U.S. returns the ball during a Madrid Open tennis tournament match against Carla Suarez from Spain in Madrid, Spain, Thursday, May 8, 2014 . (AP Photo/Daniel Ochoa de Olza)

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Serena Williams from the U.S. returns the ball during a Madrid Open tennis tournament match against Carla Suarez from Spain in Madrid, Spain, Thursday, May 8, 2014 . (AP Photo/Daniel Ochoa de Olza)

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Serena Williams from the U.S. serves the ball during a Madrid Open tennis tournament match against Carla Suarez from Spain in Madrid, Spain, Thursday, May 8, 2014 . (AP Photo/Daniel Ochoa de Olza)