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Dominic Thiem of Austria serves 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 serves 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)