Kong Lingwei (C) of China competes during the women's 4x100m relay final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. China ranked the third with 42.71 seconds. (Xinhua/Alberto Pezzali)

(from L to R) Wei Yongli, Ge Manqi, Liang Xiaojing and Kong Lingwei of China pose after the women's 4x100m relay final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. China ranked the third with 42.71 seconds. (Xinhua/Alberto Pezzali)

Akani Simbine (L) of South Africa competes during the men's 100m final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. Akani Simbine won the gold medal with 9.93 seconds. (Xinhua/Alberto Pezzali)

Laura Muir of Great Britain celebrates after the women's 1500m final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. Muir won the gold medal with 3 minutes and 58.25 seconds. (Xinhua/Alberto Pezzali)

Laura Muir of Great Britain competes during the women's 1500m final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. Muir won the gold medal with 3 minutes and 58.25 seconds (Xinhua/Alberto Pezzali)

Akani Simbine of South Africa celebrates after the men's 100m final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. Akani Simbine won the gold medal with 9.93 seconds. (Xinhua/Alberto Pezzali)

Akani Simbine of South Africa celebrates after the men's 100m final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. Akani Simbine won the gold medal with 9.93 seconds. (Xinhua/Alberto Pezzali)

Hagos Gebrhiwet (R) of Ethiopia competes in the men's 5000m final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. Hagos Gebrhiwet won the gold medal with 13 minutes and 1.86 second. (Xinhua/Alberto Pezzali)

Liang Xiaojing of China poses before the women's 4x100m relay final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. China ranked the third with 42.71 seconds. (Xinhua/Alberto Pezzali)

Liang Xiaojing of China competes during the women's 4x100m relay final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. China ranked the third with 42.71 seconds. (Xinhua/Alberto Pezzali)

(from L to R) Wei Yongli, Ge Manqi, Liang Xiaojing and Kong Lingwei of China pose after the women's 4x100m relay final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. China ranked the third with 42.71 seconds. (Xinhua/Alberto Pezzali)

Kong Lingwei (L) of China competes during the women's 4x100m relay final at Muller Anniversary Games at London Stadium in London, Britain, on July 20, 2019. China ranked the third with 42.71 seconds. (Xinhua/Alberto Pezzali)