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