Sydney McLaughlin produced another astonishing run as she broke her own world record by almost three-quarters of a second to take 400m hurdles gold at the World Championships in Eugene.

 

The 22-year-old American left her rivals for dust as she came home in 50.68 seconds, smashing her own record of 51.41 seconds set in June.

 

A new-look Great Britain quartet won 4x100m bronze in the final race of day nine of the World Championships.

 

With Jona Efoloko, 22, preferred to Adam Gemili on the opening leg and Reece Prescod on the anchor, Britain held off Jamaica to ensure a medal.

 

Canada exploited a slack final changeover from the United States to take gold ahead of their neighbour.

 

A mystery leg injury to Dina Asher-Smith cost Great Britain's women a shot at a medal in the 4x100m relay.

 

The 26-year-old, who finished fourth in the 100m and won bronze over 200m during a hectic schedule in Oregon, hobbled through the final 15m of her third leg.

 

Great Britain, who had been third in the race, slipped back to eighth as she slowed. Daryll Neita ran the fastest split of anyone in the race - 9.57 seconds - on the anchor leg, but it was only enough to regain sixth.

Defending champion Nia Ali crashed out of 100m hurdles heats at the World Championships in Eugene.

 

The 33-year-old American was leading the race until she hit her knee on the penultimate barrier.

 

She struggled to regain balance and fell at the final hurdle as Jamaican training partner Britany Anderson won the heat in a time of 12.59 seconds.

 

"I just let my technique get away from me and it cost me everything," said Ali.

 

A silver medallist at Tokyo 2020, Ali added it was the first time a fall like that had happened to her.

That was a thrilling final day with a silver and bronze for GB and two world records in the women's 100m hurdles and men's pole vault.

Tobi Amusan broke the 100m hurdles world record with a stunning semi-final time of 12.12 seconds - before taking gold at the World Athletics Championships in Eugene, Oregon.

 

The Nigerian, 25, ran even faster in the final - but her 12.06 was ruled ineligible by an illegal tailwind.