Dalilah Muhammad has set a new world record of 52.16 seconds in winning the women's 400-meter hurdles, narrowly beating fellow American Sydney McLaughlin.
Muhammad had set the earlier record of 52.20 when she beat McLaughlin to win the U.S. national title in July in Des Moines, Iowa.
McLaughlin closed down Muhammad on the back straight, but Muhammad showed strong speed on the exit of the second turn and held her lead to the line to win by .07 seconds.
Rushell Clayton of Jamaica took bronze in 53.74.
The Olympic bronze medalist Ashley Spencer briefly looked on course to seal a U.S. podium sweep — something no country has managed at these championships — but faded on the final stretch and was sixth.
