Andy Murray

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Novak Djokovic, of Serbia, reacts after defeating Andy Murray, of Britain, 7-6 (1), 6-7 (1), 6-2, 6-4 during the quarterfinals of the U.S. Open tennis tournament, early Thursday, Sept. 4, 2014, in New York. (AP Photo/John Minchillo)

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Andy Murray, of the United Kingdom, chases down a ball against Robin Haase, of the Netherlands, during the opening round of the 2014 U.S. Open tennis tournament, Monday, Aug. 25, 2014, in New York. (AP Photo/Kathy Willens)

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Andy Murray of Britain plays a return to Kevin Anderson of South Africa during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 30, 2014. (AP Photo/Pavel Golovkin)

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Defending champion Andy Murray of Britain returns to Biaz Rola of Slovenia during their men's singles match at the All England Lawn Tennis Championships in Wimbledon, London, Wednesday, June 25, 2014. (AP Photo/Sang Tan)

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Andy Murray of Britain plays a return to David Goffin of Belgium during their first round match at the All England Lawn Tennis Championships in Wimbledon, London, Monday, June 23, 2014. (AP Photo/Pavel Golovkin)

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Britain's Andy Murray celebrates winning the third round match of the French Open tennis tournament against Germany's Philipp Kohlschreiber at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. Murray won in five sets 3-6, 6-3, 6-3, 4-6, 12-10. (AP Photo/Darko Vojinovic)

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Britain's Andy Murray towels off after winning the third round match of the French Open tennis tournament against Germany's Philipp Kohlschreiber at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. Murray won in five sets 3-6, 6-3, 6-3, 4-6, 12-10. (AP Photo/Darko Vojinovic)

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Britain's Andy Murray returns the ball during the third round match of the French Open tennis tournament against Germany's Philipp Kohlschreiber at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. Murray won in five sets 3-6, 6-3, 6-3, 4-6, 12-10. (AP Photo/Darko Vojinovic)

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Britain's Andy Murray prepares to serve the ball during the third round match of the French Open tennis tournament against Germany's Philipp Kohlschreiber at the Roland Garros stadium, in Paris, France, Sunday, June 1, 2014. Murray won in five sets 3-6, 6-3, 6-3, 4-6, 12-10. (AP Photo/Darko Vojinovic)