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Daniil Medvedev of Russia serves during the final match against Borna Coric of Croatia at St. Petersburg Open ATP tennis tour in St. Petersburg, Russia, Sept. 22, 2019. (Xinhua/Irina Motina)
Daniil Medvedev of Russia serves during the final match against Borna Coric of Croatia at St. Petersburg Open ATP tennis tour in St. Petersburg, Russia, Sept. 22, 2019. (Xinhua/Irina Motina)