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Daniil Medvedev of Russia competes during the singles group match against Rafael Nadal of Spain at the ATP World Tour Finals 2019 in London, Britain on Nov. 13, 2019. (Xinhua/Han Yan)
Daniil Medvedev of Russia competes during the singles group match against Rafael Nadal of Spain at the ATP World Tour Finals 2019 in London, Britain on Nov. 13, 2019. (Xinhua/Han Yan)