Rafael Nadal of Spain serves to Novak Djokovic of Serbia  during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Rafael Nadal of Spain serves to Novak Djokovic of Serbia during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

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