DES MOINES: Olympic champion Dalilah Muhammad set the world record at the 400m hurdles on Sunday when she rode 52.20s in the rain at the United States National Championships.
Muhammad's time exceeded the previous 52.34s mark set by Russian Yuliya Pechonkina in 2003.
"My coach kept telling me that it was there," Muhammad told NBC.
"I just had to trust and decide. I wanted it so much that I knew I had to go out there and prove myself. "
Muhammad has been working hard to outshine the athletes ahead of her, including 2015 silver medalist Shamier Little and the American U20, record holder Sydney McLaughlin.
She had a clear lead as she boarded the final stretch with Little, McLaughlin and Ashley Spencer to fight for podiums.
McLaughlin finished second in 52.88 seconds, just 0.13 seconds behind her personal best, with Spencer in third in 53.11s, which is her best time.