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