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