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