LONDON, ENGLAND - NOVEMBER 17: David Goffin of Belgium in action during his singles match against Novak Djokovic of Serbia on day five of the ATP World Tour Finals at the O2 Arena on November 17, 2016 in London, England.
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Photo credit: © Paul Cunningham / Alamy / Afripics
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Keywords: action, atp, ball, championship, compete, excitement, finals, photography, racket, serve, speed, sports, tennis, tour, tournament, volley, world