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