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ATP World Tour Finals: Novak Djokovic delighted after retaining title in London

Novak Djokovic of Serbia hits a forehand in his men's singles final match against Rafael Nadal of Spain during day eight of the Barclays ATP World Tour Finals at O2 Arena on November 11, 2013 in London, England
Image: Novak Djokovic: Serb won four straight titles to finish 2013 season