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Wang Chuqin (L) of China signs autograph on a boy's T-shirt after the men's singles table tennis event at the 2018 Summer Youth Olympic Games in Buenos Aires, Argentina, on Oct. 10, 2018. Wang Chuqin won 4-1. (Xinhua/Li Ming)

Wang Chuqin (L) of China signs autograph on a boy's T-shirt after the men's singles table tennis event at the 2018 Summer Youth Olympic Games in Buenos Aires, Argentina, on Oct. 10, 2018. Wang Chuqin won 4-1. (Xinhua/Li Ming)