
Justin Gatlin (C) of the United Stats competes during the men's 100 meters heat on Day One at the World Athletics Championships in London, Britain, on Aug. 4, 2017. (Xinhua/Han Yan)

Justin Gatlin (C) of the United Stats competes during the men's 100 meters heat on Day One at the World Athletics Championships in London, Britain, on Aug. 4, 2017. (Xinhua/Han Yan)