Serena Williams from U.S. returns the ball during the match against Maria Kirilenko from Russia at the Madrid Open tennis tournament, in Madrid, Thursday, May 9, 2013. (AP Photo/Andres Kudacki)

Associated Press
Serena Williams from U.S. returns the ball during the match against Maria Kirilenko from Russia at the Madrid Open tennis tournament, in Madrid, Thursday, May 9, 2013. (AP Photo/Andres Kudacki)
Serena Williams from U.S. returns the ball during the match against Maria Kirilenko from Russia at the Madrid Open tennis tournament, in Madrid, Thursday, May 9, 2013. (AP Photo/Andres Kudacki)
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