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Alexander Zverev of Germany returns the ball during the men's singles semifinal at 2019 China Open tennis tournament in Beijing, capital of China ,Oct. 5, 2019. (Xinhua/Li Yibo)
Alexander Zverev of Germany returns the ball during the men's singles semifinal at 2019 China Open tennis tournament in Beijing, capital of China ,Oct. 5, 2019. (Xinhua/Li Yibo)