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AP Tomas Berdych of Czech Republic serves to Novak Djokovic of Serbia during their ATP World Tour Finals singles tennis match at the O2 Arena in London, - Photo

Tomas Berdych of Czech Republic serves to Novak Djokovic of Serbia during their ATP World Tour Finals singles tennis match at the O2 Arena in London,

Friday November 9, 04:10 PM
Tomas Berdych of Czech Republic serves to Novak Djokovic of Serbia during their ATP World Tour Finals singles tennis match at the O2 Arena in London, Friday, Nov. 9, 2012. (AP Photo/Kirsty Wigglesworth)