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

Britain Tennis ATP Finals

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

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