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