Germany's Angelique Kerber returns the ball to Poland's Katarzyna Piter during the first round match of  the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)

France Tennis French Open

Germany's Angelique Kerber returns the ball to Poland's Katarzyna Piter during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, May 25, 2014. (AP Photo/David Vincent)

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