Novak Djokovic of Serbia celebrates beating Tomas Berdych of the Czech Republic during their singles tennis match at the ATP World Tour Finals in London Friday, Nov. 9, 2012. (AP Photo/Kirsty Wigglesworth)

Associated Press
Novak Djokovic of Serbia celebrates beating Tomas Berdych of the Czech Republic during their singles tennis match at the ATP World Tour Finals in London Friday, Nov. 9, 2012. (AP Photo/Kirsty Wigglesworth)
Novak Djokovic of Serbia celebrates beating Tomas Berdych of the Czech Republic during their singles tennis match at the ATP World Tour Finals in London Friday, Nov. 9, 2012. (AP Photo/Kirsty Wigglesworth)
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