World Record 400 Hurdles Men. It took until 1948 for a man to run a flat 400 metres under 46 seconds, and the world record in the 400 flat is 43.03. Many people thought this would be the best race of the 2020 athletics’ events, but we weren’t expecting this.

Rai benjamin won silver in his olympic debut, clocking 46.17 to break. Rai benjamin of the usa came second to win silver (46.17),.