The French Open

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Defending champion Spain's Rafael Nadal smiles during a training session for the French Open tennis tournament, at the Roland Garros stadium in Paris, Friday, May 23, 2014. The French Open tennis championship will start Sunday. (AP Photo/Bertrand Combaldieu)

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Kei Nishikori, of Japan, eyes the ball during a training session for the French Open tennis tournament, at the Roland Garros stadium in Paris, Friday, May 23, 2014. The French Open tennis tournament starts Sunday. (AP Photo/Michel Euler)

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Defending champions Serena Williams, of the U.S, left, and Spain's Rafael Nadal pose during the draw for the French Open Tennis tournament, at the Roland Garros stadium in Paris, Friday, May 23, 2014. The French Open tennis tournament starts Sunday. At left is the women's trophy, at right, the men's trophy. (AP Photo/Michel Euler)

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Defending champion Spain's Rafael Nadal holds a token during the Women's singles draw for the French Open Tennis tournament, at the Roland Garros stadium in Paris, Friday, May 23, 2014. The French Open tennis tournament starts Sunday. (AP Photo/Michel Euler)