China's Ma Long (rear R) and Xu Xin (rear L) compete during the men's doubles quarterfinal match against Germany's Patrick Franziska and Denmark's Jonathan Groth at the 2018 ITTF World Tour Platinum German Open in Bremen, Germany, on March 23, 2018. Ma Long/Xu Xin won 3-1 and advanced to semifinals. (Xinhua/Binh Truong)