Halimah Nakaayi (Rear L) of Uganda competes with Natoya Goule (front) of Jamaica the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019. (Photos: Xinhua)

Wang Chunyu of China competes during the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019.

Halimah Nakaayi (Rear L) of Uganda competes with Natoya Goule (front) of Jamaica the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019.

Wang Chunyu of China reacts before the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019.

Wang Chunyu (1st R) of China competes during the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019.

Halimah Nakaayi (rear) of Uganda competes with Natoya Goule (front) of Jamaica the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019.

Wang Chunyu (2nd L) of China competes during the women's 800m semifinal at the 2019 IAAF World Championships in Doha, Qatar, Sept. 28, 2019.