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Daniil Medvedev of Russia hits a return during the ATP Cup semifinal match against Novak Djokovic of Serbia in Sydney, Australia, on Jan. 11, 2020. (Xinhua/Zhu Hongye)

Daniil Medvedev of Russia hits a return during the ATP Cup semifinal match against Novak Djokovic of Serbia in Sydney, Australia, on Jan. 11, 2020. (Xinhua/Zhu Hongye)