Argentina's Leonardo Mayer returns the ball to Spain's Rafael Nadal  during their third round match of  the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/Michel Euler)

France Tennis French Open

Argentina's Leonardo Mayer returns the ball to Spain's Rafael Nadal during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/Michel Euler)

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