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