Olympic champion Muhammad took gold with a time of 52.16 seconds at the Khalifa Stadium, bettering her own world record of 52.20 set at the US Trials in Iowa in July.
Muhammad wins 400m hurdles gold with world record
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Olympic champion Muhammad took gold with a time of 52.16 seconds at the Khalifa Stadium, bettering her own world record of 52.20 set at the US Trials in Iowa in July.
