LONDON, ENGLAND - NOVEMBER 17: Dominic Thiem of Switzerland during his singles match against Milos Raonic of Canada on day five of the ATP World Tour Finals at the O2 Arena on November 17, 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