Rafael Nadal of Spain holds his head during the presentation ceremony after he lost to Novak Djokovic of Serbia during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

Britain Tennis ATP Finals

Rafael Nadal of Spain holds his head during the presentation ceremony after he lost to Novak Djokovic of Serbia during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

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