
Su Bingtian of China sprints during Men's 100m Semifinal on Day 2 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 5, 2017. (Xinhua/Wang Lili)

Su Bingtian of China sprints during Men's 100m Semifinal on Day 2 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 5, 2017. (Xinhua/Wang Lili)