Paris

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Belgium's Yanina Wickmayer celebrates winning the first round match of the French Open tennis tournament against Denmark's Caroline Wozniacki at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Denmark's Caroline Wozniacki, left, shakes hands with Belgium's Yanina Wickmayer after losing the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Serbia's Jelena Jankovic returns the ball to Canada's Sharon Fichman during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Michel Euler)

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Sloane Stephens, of the U.S, returns the ball to China's Peng Shuai during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Sloane Stephens, of the U.S, returns the ball to China's Peng Shuai during the first round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Belgium's Yanina Wickmayer celebrates scoring a point during the first round match of the French Open tennis tournament against Denmark's Caroline Wozniacki at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Denmark's Caroline Wozniacki returns the ball during the first round match of the French Open tennis tournament against Belgium's Yanina Wickmayer at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)

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Denmark's Caroline Wozniacki wipes her face during the first round match of the French Open tennis tournament against Belgium's Yanina Wickmayer at the Roland Garros stadium, in Paris, France, Tuesday, May 27, 2014. (AP Photo/Darko Vojinovic)