Serena Williams, of the United States, returns the ball to Slovakia's Dominika Cibulkova, during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. (AP Photo/Riccardo De Luca)

Associated Press
Serena Williams, of the United States, returns the ball to Slovakia's Dominika Cibulkova, during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. (AP Photo/Riccardo De Luca)
Serena Williams, of the United States, returns the ball to Slovakia's Dominika Cibulkova, during their match at the Italian Open tennis tournament in Rome, Thursday, May 16, 2013. (AP Photo/Riccardo De Luca)
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