Novak Djokovic was given the warning for going over the 25-second time limit while serving at 3-1. Defending champion Novak Djokovic trounced stand-in David Goffin 6-1 6-2 for a clean sweep of his group at the ATP World Tour Finals on Thursday but still looked far from happy as he picked a row with the chair umpire. "You have no clue about the game," a irate Djokovic told Murphy at the changeover before turning to continue the debate with tournament director Tom Barnes. Djokovic will face the runner-up of the John McEnroe group in the semi-finals, be it Murray, Kei Nishikori or Stan Wawrinka. Later on Thursday Canada's Raonic and Austrian Thiem face off with the winner joining Djokovic in the semis.

Source: dna November 17, 2016 17:46 UTC