
Nafissatou Thiam of Belgium competes during the 100m hurdles heat in women's Heptathlon on Day 2 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 5, 2017. (Xinhua/Han Yan)

Nafissatou Thiam of Belgium competes during the 100m hurdles heat in women's Heptathlon on Day 2 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 5, 2017. (Xinhua/Han Yan)