Novak Djokovic of Serbia celebrates after beating Jo-Wilfried Tsonga of France during 

Novak Djokovic of Serbia celebrates after beating Jo-Wilfried Tsonga of France during their singles tennis match at the ATP World Tour Finals in London Monday, Nov. 5, 2012. (AP Photo/Kirsty Wigglesworth)
Associated Press
Novak Djokovic of Serbia celebrates after beating Jo-Wilfried Tsonga of France during their singles tennis match at the ATP World Tour Finals in London Monday, Nov. 5, 2012. (AP Photo/Kirsty Wigglesworth)
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