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Xu Xin of China serves during the men's singles semifinal match against his compatriot Ma Long at the 2019 ITTF World Tour Grand Finals in Zhengzhou, central China's Henan Province, Dec. 14, 2019. (Xinhua/Li Jianan)
Xu Xin of China serves during the men's singles semifinal match against his compatriot Ma Long at the 2019 ITTF World Tour Grand Finals in Zhengzhou, central China's Henan Province, Dec. 14, 2019. (Xinhua/Li Jianan)