Rafael Nadal of Spain plays a 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 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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