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Lin Gaoyuan of China serves during the men's singles first round match against Marcos Freitas of Portugal in 2017 ITTF table tennis World Cup in Liege, Belgium, Oct. 21, 2017. Lin Gaoyuan won 4-1. (Xinhua/Ye Pingfan)

Lin Gaoyuan of China serves during the men's singles first round match against Marcos Freitas of Portugal in 2017 ITTF table tennis World Cup in Liege, Belgium, Oct. 21, 2017. Lin Gaoyuan won 4-1. (Xinhua/Ye Pingfan)