LONDON, ENGLAND - NOVEMBER 18: Kei Nishikori of Japan in action during his singles match against Marin Cilic of Croatia on day six of the ATP World Tour Finals at the O2 Arena on November 18, 2016 in London, England

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Keywords: action, atp, ball, championship, compete, excitement, finals, photography, racket, serve, speed, sports, tennis, tour, tournament, volley, world