Roger Federer of Switzerland celebrates winning his tennis match against Richard Gasquet of France at the ATP World Tour Finals at the O2 Arena in London, Thursday, Nov. 7, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Roger Federer of Switzerland celebrates winning his tennis match against Richard Gasquet of France at the ATP World Tour Finals at the O2 Arena in London, Thursday, Nov. 7, 2013. (AP Photo/Kirsty Wigglesworth)

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