David Goffin of Belgium celebrates during the group match with Novak Djokovic of Serbia at the 2016 ATP World Tour Final at O2 in London, Britain on Nov. 17, 2016. Djokovic won 2-0. (Xinhua/Han Yan)
David Goffin of Belgium celebrates during the group match with Novak Djokovic of Serbia at the 2016 ATP World Tour Final at O2 in London, Britain on Nov. 17, 2016. Djokovic won 2-0. (Xinhua/Han Yan)
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