The French Open

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Russia's Svetlana Kuznetsova asks for her towel after falling on the clay as he plays Petra Kvitova, of the Czech Republic, during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/Michel Spingler)

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Lucie Safarova of the Czech Republic returns the ball to Serbia's Ana Ivanovic during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)

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Serbia's Ana Ivanovic kneels after returning the ball to Lucie Safarova of the Czech Republic during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)

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Lucie Safarova of the Czech Republic reacts after a winning point as she plays Serbia's Ana Ivanovic during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)

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Serbia's Ana Ivanovic, left, argues over a referee decision as she plays Lucie Safarova of the Czech Republic during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)