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Alexander Zverev of Germany reacts during the men's singles quarter final match against Sam Querrey of the United States at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 4, 2019. (Xinhua/Zhang Chenlin)
Alexander Zverev of Germany reacts during the men's singles quarter final match against Sam Querrey of the United States at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 4, 2019. (Xinhua/Zhang Chenlin)