Serbia

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Novak Djokovic of Serbia defeated Roger Federer of Switzerland during the men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday. (AP Photo/Pavel Golovkin)

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Novak Djokovic of Serbia celebrates defeating Roger Federer of Switzerland in the men's singles final at the All England Lawn Tennis Championships in Wimbledon, London, Sunday July 6, 2014. (AP Photo/Ben Curtis)

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

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

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