China's Xie Zhenye (L) competes during the men's 100m heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 27, 2019. (Xinhua/Jia Yuchen)

China's Xie Zhenye (2nd R) competes during the men's 100m heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 27, 2019. (Xinhua/Jia Yuchen)

China's Su Bingtian competes during the men's 100m heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 27, 2019. (Xinhua/Li Gang)

China's Su Bingtian (C) competes during the men's 100m heat at the 2019 IAAF World Athletics Championships in Doha, Qatar, on Sept. 27, 2019. (Xinhua/Li Gang)