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AP Novak Djokovic of Serbia arrives on court to face Tomas Berdych of Czech Republic during their ATP World Tour Finals singles tennis match at the O2 Ar - Photo

Novak Djokovic of Serbia arrives on court to face Tomas Berdych of Czech Republic during their ATP World Tour Finals singles tennis match at the O2 Ar

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