Novak Djokovic of Serbia arrives to play against Roger Federer of Switzerland at the ATP World Tour Finals at the O2 Arena in London, Tuesday, Nov. 5, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Novak Djokovic of Serbia arrives to play against Roger Federer of Switzerland at the ATP World Tour Finals at the O2 Arena in London, Tuesday, Nov. 5, 2013. (AP Photo/Kirsty Wigglesworth)

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