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Grigor Dimitrov of Bulgaria hits a return during 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 hits a return during 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)