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PHOTO GALLERY: Djokovic beats world number one Nadal to win Tour Finals title




Novak Djokovic of Serbia plays a return to Rafael Nadal of Spain during the final ATP World Tour Finals tennis match at the O2 Arena in London, Monday, Nov. 11, 2013 (Photo: AP)

Rafael Nadal of Spain plays a shot to Novak Djokovic of Serbia during their men's final singles tennis match at the ATP World Tour Finals at the O2 Arena in London November 11, 2013 (Photo: Reuters)

Novak Djokovic of Serbia serves to Rafael Nadal of Spain during the final of the ATP World Tour Finals at the O2 Arena in London, Monday, Nov. 11, 2013 (Photo: AP)

Rafael Nadal of Spain plays a shot to Novak Djokovic of Serbia during their men's final singles tennis match at the ATP World Tour Finals at the O2 Arena in London November 11, 2013 (Photo: Reuters)

Novak Djokovic of Serbia, left, holds the ATP World Tour Finals tennis trophy as he stands next to Rafael Nadal of Spain photographers after defeating Nadal at the O2 Arena in London, Monday, Nov. 11, 2013 (Photo: AP)

Novak Djokovic of Serbia prepares to lift the trophy after winning the final of the ATP World Tour Finals singles tennis match against Rafael Nadal of Spain at the O2 Arena in London Monday, Nov. 11, 2013 (Photo: AP)