Xie Zhenye of China competes in the men's 4x100m relay final during the 201...

Hellen Obiri (R) of Kenya competes in the women's 5000m final during the 20...

Lynsey Sharp (L) of Britain competes in the women's 800m final during the 2...

Rushell Clayton of Jamaica reacts after the women's 400m Hurdles Final duri...

Rushell Clayton of Jamaica reacts after the women's 400m Hurdles Final duri...

Xu Haiyang of China is seen ahead of the men's 4x100m relay final during th...

Shelly-Ann Fraser-Pryce of Jamaica (L) competes in the women's 100m final d...

Hellen Obiri of Kenya celebrates after the women's 5000m final during the 2...

Lynsey Sharp (2nd R) of Britain competes in the women's 800m final during t...

Xie Wenjun (C) of China celebrates after the men's 110m hurdles final at Mu...

Xie Wenjun of China celebrates after the men's 110m hurdles final at Muller...

Xie Wenjun of China celebrates after the men's 110m hurdles final at Muller...

Xie Wenjun (C) of China competes during the men's 110m hurdles final at Mul...

Xie Wenjun (C) of China competes during the men's 110m hurdles final at Mul...

Xie Wenjun of China celebrates after the men's 110m hurdles final at Muller...

Xie Zhenye of China celebrates after the men's 200m final at Muller Anniver...

Xie Zhenye (2nd L) of China celebrates after the men's 200m final at Muller...

Xie Zhenye of China celebrates after the men's 200m final at Muller Anniver...

Xie Zhenye of China celebrates after the men's 200m final at Muller Anniver...

Xie Zhenye of China celebrates after the men's 200m final at Muller Anniver...

Xie Zhenye (L) of China competes during the men's 200m final at Muller Anni...

Xie Wenjun of China celebrates after the men's 110m hurdles final at Muller...

Akani Simbine (L) of South Africa competes during the men's 100m final at M...

Laura Muir of Great Britain celebrates after the women's 1500m final at Mul...

Laura Muir of Great Britain competes during the women's 1500m final at Mull...

Akani Simbine of South Africa celebrates after the men's 100m final at Mull...

Akani Simbine of South Africa celebrates after the men's 100m final at Mull...

Liang Xiaojing of China poses before the women's 4x100m relay final at Mull...

Liang Xiaojing of China competes during the women's 4x100m relay final at M...

(From L to R) Wei Yongli, Ge Manqi, Liang Xiaojing and Kong Lingwei of Chin...

Kong Lingwei (L) of China competes during the women's 4x100m relay final at...

Kong Lingwei (C) of China competes during the women's 4x100m relay final at...

(From L to R) Wei Yongli, Ge Manqi, Liang Xiaojing and Kong Lingwei of Chin...

Hagos Gebrhiwet (R) of Ethiopia competes in the men's 5000m final at Muller...