Olympic champ Dalilah Muhammad sets new 400 meter hurdles record in 52.20 seconds, smashed previous mark of 52.34 seconds.

Dalilah Muhammad on Sunday, set the world record in the 400 metres hurdles when she ran a blistering 52.20 seconds in the rain at the United States national championships.

Muhammad’s time smashed the previous mark of 52.34 seconds set by Russian Yuliya Pechonkina in 2003.McLaughlin finished second in 52.88, just 0.13 shy of her personal best, with Spencer third in 53.11, equalling her best.