The women's 400 metres hurdles at the 2013 World Championships in Athletics was held at the Luzhniki Stadium on 12–15 August.

[1] Running on home soil, reigning Olympic Champion Natalya Antyukh might have been expected to be the favorite.

The distant bronze medalist Zuzana Hejnová in 2012 was the 2013 world leader.

It was Demus took off in lane 4 and was the leader down the back stretch, with training partner Dalilah Muhammad almost on the same pace.

Demus' arm carry noticeably dropped, she had played her best card and Hejnová had trumped it.