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Grigor Dimitrov of Bulgaria celebrates after the singles group match against David Goffin of Belgium during the Nitto ATP World Tour Finals at O2 Arena in London, Britain on Nov. 15, 2017. Dimitrov won 2-0. (Xinhua/Han Yan)
Grigor Dimitrov of Bulgaria celebrates after the singles group match against David Goffin of Belgium during the Nitto ATP World Tour Finals at O2 Arena in London, Britain on Nov. 15, 2017. Dimitrov won 2-0. (Xinhua/Han Yan)