
China's Xu Jiayu is seen before the men's 100m backstroke swimming final at the 17th FINA Aquatics World Championships held in Budapest, Hungary on July 25, 2017. (Xinhua/Ding Xu)

China's Xu Jiayu is seen before the men's 100m backstroke swimming final at the 17th FINA Aquatics World Championships held in Budapest, Hungary on July 25, 2017. (Xinhua/Ding Xu)