Liang Jingkun and Zhou Kai (Front) of China return the ball during the men's doubles final against Jeoung Youngsik and Lee Sangsu of South Korea at the 2018 ITTF World tour Japan Open in Kitakyushu, Japan, on June 10, 2018. Jeoung Youngsik and Lee Sangsu won 4-2. (Xinhua/Ma Ping)