DOHA—American Dalilah Muhammad broke her own world record to win the women’s 400 meters hurdles at the world championships with a time of 52.16 seconds on Oct. 4, edging out compatriot Sydney McLaughlin in a gripping race.
The 29-year-old Muhammad, the 2016 Olympic champion, crossed the finish line 0.04 seconds faster than her previous world record set in July.
