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

France Tennis French Open

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

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