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David Goffin of Belgium serves during the singles round-robin match against Dominic Thiem of Austria during the Nitto ATP World Tour Finals at O2 Arena in London, Britain on Nov. 17, 2017. David Goffin won 2-0. (Xinhua/Tang Shi)
David Goffin of Belgium serves during the singles round-robin match against Dominic Thiem of Austria during the Nitto ATP World Tour Finals at O2 Arena in London, Britain on Nov. 17, 2017. David Goffin won 2-0. (Xinhua/Tang Shi)