United States' Serena Williams returns the ball to Germany's Andrea Petkovic at the Italian open tennis tournament in Rome, Wednesday, May 14, 2014. (AP Photo/Riccardo De Luca)

Italy Tennis Italian Open

United States' Serena Williams returns the ball to Germany's Andrea Petkovic at the Italian open tennis tournament in Rome, Wednesday, May 14, 2014. (AP Photo/Riccardo De Luca)

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