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Felix Auger-Aliassime of Canada returns a shot during the men's singles second round match against Alexander Zverev of Germany at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 3, 2019. (Xinhua/Li Yibo)

Felix Auger-Aliassime of Canada returns a shot during the men's singles second round match against Alexander Zverev of Germany at the 2019 China Open tennis tournament in Beijing, capital of China, Oct. 3, 2019. (Xinhua/Li Yibo)