Germany's Andrea Petkovic returns the ball during the quarterfinal match of the French Open tennis tournament against Italy's Sara Errani at the Roland Garros stadium, in Paris, France, Wednesday, June 4, 2014.  (AP Photo/Darko Vojinovic)

France Tennis French Open

Germany's Andrea Petkovic returns the ball during the quarterfinal match of the French Open tennis tournament against Italy's Sara Errani at the Roland Garros stadium, in Paris, France, Wednesday, June 4, 2014. (AP Photo/Darko Vojinovic)

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