The French Open

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Japan's Kei Nishikori returns the ball during the first round match of the French Open tennis tournament against Slovakia's Martin Klizan at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/David Vincent)

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Slovakia's Martin Klizan celebrates defeating Japan's Kei Nishikori in three sets 7-6, 6-1, 6-2, in the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/David Vincent)

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Former German tennis ace Boris Becker, center, watches Serbia's Novak Djokovic playing Portugal's Joao Sousa during their first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)

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Serbia's Novak Djokovic returns the ball to Portugal's Joao Sousa during their first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Monday, May 26, 2014. (AP Photo/Michel Euler)