The 28-year-old American had a few nervous moments after initially being disqualified for crashing into the final hurdle and affecting other athletes as he raced for the line.

Benjamin’s appeal was quickly upheld, however, and he was restored to the top of the timesheet with World Athletics confirming he was the champion.

Brazil’s Alison Dos Santos briefly held another world title to go with his 2022 triumph after finishing second in 46.84, but will have to be satisfied with silver.

Qatari Abderrahman Samba took bronze in 47.06, while Norway’s world record holder Karsten Warholm, who was gunning for a fourth world title, finished fifth in 47.58 behind Nigerian Ezekiel Nathaniel (47.11).

“I had something happen when I got out of the block, like a little strain in my left thigh,” said Warholm.

“I don’t know if it’s a hamstring or knee. Trying to hurdle with it wasn’t good. I also crashed the third hurdle. I tried to push but it was just a terrible race. A disaster.”