Roger Federer of Switzerland plays a return to Richard Gasquet of France during their ATP World Tour Finals tennis match at the O2 Arena in London, Thursday, Nov. 7, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Roger Federer of Switzerland plays a return to Richard Gasquet of France during their ATP World Tour Finals tennis match at the O2 Arena in London, Thursday, Nov. 7, 2013. (AP Photo/Kirsty Wigglesworth)

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