Usain Bolt (L) of Jamaica and Christian Coleman (R) of the United States compete during Men's 100m semifinal of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 5, 2017. World record holder Usain Bolt reached the men's finals at the World Athletics Championships here on Saturday. Bolt, who will retire after the event, clocked 9.98 seconds in his heat, finishing second behind American youngster Christian Coleman in 9.97. (Xinhua/Luo huanhuan)
