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