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