Rafael Nadal of Spain shakes his head of perspiration after Novak Djokovic of Serbia, right, wins the final of the ATP World Tour Finals single tennis match at the O2 Arena in London Monday, Nov. 11, 2013. (AP Photo/Sang Tan)

Britain Tennis ATP Finals

Rafael Nadal of Spain shakes his head of perspiration after Novak Djokovic of Serbia, right, wins the final of the ATP World Tour Finals single tennis match at the O2 Arena in London Monday, Nov. 11, 2013. (AP Photo/Sang Tan)

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