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Grigor Dimitrov of Bulgaria hits a return to Dominic Thiem of Austria during his group stage match in the ATP World Tour Finals at O2 Arena in London, Britain on Nov. 13, 2017. Grigor Dimitrov won 2-1. (Xinhua/Han Yan)
Grigor Dimitrov of Bulgaria hits a return to Dominic Thiem of Austria during his group stage match in the ATP World Tour Finals at O2 Arena in London, Britain on Nov. 13, 2017. Grigor Dimitrov won 2-1. (Xinhua/Han Yan)