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Dominic Thiem of Austria serves during the singles group match against Rafael Nadal of Spain at the ATP World Tour Finals 2020 in London, Britain, on Nov. 17, 2020. (Xinhua/Han Yan)
Dominic Thiem of Austria serves during the singles group match against Rafael Nadal of Spain at the ATP World Tour Finals 2020 in London, Britain, on Nov. 17, 2020. (Xinhua/Han Yan)