The 27-year-old Rio Olympics Champion Dalilah Muhammad won the race in a new personal best of 52,64 seconds. Shamier Little shaved 0.76 seconds from her PB to win second place in 52.75 seconds, while Kori Carter concluded the podium in a new PB 52.95sec.
The top three women will represent the United States at the London World Athletics championships in August.
Women's 400m Hurdles final results
1 Dalilah Muhammad 52.64 2 Shamier Little 52.75 3 Kori Carter 52.95 4 Ashley Spencer 53.11 5 Georganne Moline 53.14 6 Sydney McLaughlin 53.82 7 Jaide Stepter 55.06 8 Anna Cockrell 55.14
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