Liu Cheng (Top) and Zhang Nan of China compete during the men's doubles semifinal match against Li Junhui and Liu Yuchen of China at the BWF (Badminton World Federation) World Championships 2018 in Nanjing, capital of east China's Jiangsu Province, Aug. 4, 2018. Li and Liu won 2-0. (Xinhua/Ji Chunpeng) ?