Serena Williams from U.S. returns a ball during the match against Sara Errani from Italy during the Madrid Open tennis tournament, in Madrid, Saturday, May 11, 2013. (AP Photo/Andres Kudacki)

Associated Press
Serena Williams from U.S. returns a ball during the match against Sara Errani from Italy during the Madrid Open tennis tournament, in Madrid, Saturday, May 11, 2013. (AP Photo/Andres Kudacki)
Serena Williams from U.S. returns a ball during the match against Sara Errani from Italy during the Madrid Open tennis tournament, in Madrid, Saturday, May 11, 2013. (AP Photo/Andres Kudacki)
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