Serbia's Novak Djokovic returns against Germany's Philipp Kohlschreiber in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Monday June 3, 2013. (AP Photo/Michel Spingler)
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Serbia's Novak Djokovic returns against Germany's Philipp Kohlschreiber in their fourth round match at the French Open tennis tournament, at Roland Garros stadium in Paris, Monday June 3, 2013. (AP Photo/Michel Spingler)
