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

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