France

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Serbia's Novak Djokovic returns the ball during the fourth round match of the French Open tennis tournament against France's Jo-Wilfried Tsonga at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. (AP Photo/David Vincent)

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Serbia's Novak Djokovic, right, shakes hands with France's Jo-Wilfried Tsonga after their fourth round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. Djokovic won 6-1, 6-4, 6-1. (AP Photo/David Vincent)

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Serbia's Novak Djokovic celebrates winning the fourth round match of the French Open tennis tournament against France's Jo-Wilfried Tsonga at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. Djokovic won in three sets 6-1, 6-4, 6-1. (AP Photo/Michel Euler)