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

Britain Tennis ATP Finals

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

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