ATP World Tour Finals - Day Eight

ATP World Tour Finals - Day Eight
LONDON, ENGLAND - NOVEMBER 12: Novak Djokovic of Serbia receives assistance for an injury after diving to reach a shot during his men's singles final match against Roger Federer of Switzerland during day eight of the ATP World Tour Finals at O2 Arena on November 12, 2012 in London, England. (Photo by Matthew Lewis/Getty Images)
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