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Daniil Medvedev of Russia returns a shot 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 returns a shot 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)