China's Ma Long (R) and Germany's Timo Boll react before the men's doubles round of 64 match against Tamas Lakatos and Krisztian Nagy of Hungary at the 2017 World Table Tennis Championships in Dusseldorf, Germany, on May 30, 2017. Ma Long and Timo Boll won 4-0. (Xinhua/Tao Xiyi)
