Serena Williams of the U.S. returns the ball during the second round match of the French Open tennis tournament against Spain's Garbine Muguruza at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. Williams lost in two sets 2-6, 2-6. (AP Photo/Darko Vojinovic)

France Tennis French Open

Serena Williams of the U.S. returns the ball during the second round match of the French Open tennis tournament against Spain's Garbine Muguruza at the Roland Garros stadium, in Paris, France, Wednesday, May 28, 2014. Williams lost in two sets 2-6, 2-6. (AP Photo/Darko Vojinovic)

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