Rafael Nadal of Spain walks onto court fro his match against Novak Djokovic of Serbia in the final of the ATP World Tour Finals tennis at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Rafael Nadal of Spain walks onto court fro his match against Novak Djokovic of Serbia in the final of the ATP World Tour Finals tennis at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

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