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Stefanos Tsitsipas of Greece signs autograph after the men's quarter final match against John Isner of the United States at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 4,2019. (Xinhua/Li Yibo)
Stefanos Tsitsipas of Greece signs autograph after the men's quarter final match against John Isner of the United States at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 4,2019. (Xinhua/Li Yibo)