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Karen Khachanov of Russia returns the ball to Joao Sousa of Portugal during their round of 16 match at St. Petersburg Open ATP tennis tournament in St. Petersburg, Russia, Sept. 19, 2019. (Xinhua/Irina Motina)
Karen Khachanov of Russia returns the ball to Joao Sousa of Portugal during their round of 16 match at St. Petersburg Open ATP tennis tournament in St. Petersburg, Russia, Sept. 19, 2019. (Xinhua/Irina Motina)