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David Goffin of Belgium reacts during his group stage match against Rafael Nadal of Spain in the ATP World Tour Finals at O2 Arena in London, Britain on Nov. 13, 2017. David Goffin won 2-1. (Xinhua/Han Yan)
David Goffin of Belgium reacts during his group stage match against Rafael Nadal of Spain in the ATP World Tour Finals at O2 Arena in London, Britain on Nov. 13, 2017. David Goffin won 2-1. (Xinhua/Han Yan)