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Dominic Thiem of Austria reacts during the singles group match against Roger Federer of Switzerland at the ATP World Tour Finals 2019 in London, Britain on Nov. 10, 2019. (Xinhua/Han Yan)
Dominic Thiem of Austria reacts during the singles group match against Roger Federer of Switzerland at the ATP World Tour Finals 2019 in London, Britain on Nov. 10, 2019. (Xinhua/Han Yan)