Novak Djokovic of Serbia serves to Andy Murray of Britain during their ATP World Tour Finals singles tennis match at the O2 Arena in London, Wednesday, Nov. 7, 2012. (AP Photo/Sang Tan)

Associated Press
Novak Djokovic of Serbia serves to Andy Murray of Britain during their ATP World Tour Finals singles tennis match at the O2 Arena in London, Wednesday, Nov. 7, 2012. (AP Photo/Sang Tan)
Novak Djokovic of Serbia serves to Andy Murray of Britain during their ATP World Tour Finals singles tennis match at the O2 Arena in London, Wednesday, Nov. 7, 2012. (AP Photo/Sang Tan)
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