LONDON, Nov. 20, 2015 - Roger Federer of Switzerland hits a return to Kei Nishikori of Japan during a men's singles group stage match at the ATP World Tour Finals in London, Britain, Nov. 19, 2015. Federer won 2-1.

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Serbia's Novak Djokovic waves to the crowd after a men's singles match against Czech Republic's Tomas Berdych the ATP World Tour Finals tennis tournament in London on Nov. 19, 2015. Djokovic won 2-0.

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Serbia's Novak Djokovic plays a shot against Czech Republic's Tomas Berdych during a men's singles match the ATP World Tour Finals tennis tournament in London on Nov. 19, 2015. Djokovic won 2-0.

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Roger Federer of Switzerland celebrates his victory over Kei Nishikori of Japan during a men's singles group stage match at the ATP World Tour Finals in London, Britain, Nov. 19, 2015. Federer won 2-1.

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