Novak Djokovic of Serbia holds up the ATP World Tour Finals tennis trophy as he poses for photographers after defeating Rafael Nadal of Spain at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

APTOPIX Britain Tennis ATP Finals

Novak Djokovic of Serbia holds up the ATP World Tour Finals tennis trophy as he poses for photographers after defeating Rafael Nadal of Spain at the O2 Arena in London, Monday, Nov. 11, 2013. (AP Photo/Kirsty Wigglesworth)

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