
Kori Carter of the United States competes during Women's 400m Hurdles Final on Day 7 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 10, 2017. Kori Carter claimed the title with 53.07 seconds. (Xinhua/Han Yan)

Kori Carter of the United States competes during Women's 400m Hurdles Final on Day 7 of the 2017 IAAF World Championships at London Stadium in London, Britain, on Aug. 10, 2017. Kori Carter claimed the title with 53.07 seconds. (Xinhua/Han Yan)