China's Ma Long(Rear, R)/Germany's Timo Boll(Rear, L) compete during the Men's Doubles match against China's Xu Xin/Zhang Jike at the 53rd Table Tennis World Championships in Suzhou, city of east China's Jiangsu Province, on April 28, 2015. Xu Xin/Zhang Jike won 4-2. (Xinhua/Li Xiang)