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Dominic Thiem of Austria serves during the singles group match against Novak Djokovic of Serbia at the ATP World Tour Finals 2019 in London, Britain on Nov. 12, 2019. (Xinhua/Han Yan)
Dominic Thiem of Austria serves during the singles group match against Novak Djokovic of Serbia at the ATP World Tour Finals 2019 in London, Britain on Nov. 12, 2019. (Xinhua/Han Yan)