Jenny Simpson broke the American two-mile record Friday night at the Drake Relays in Des Moines, Iowa.

US track star Simpson returned to her home state of Iowa set on breaking the four year-old record and delivered with a 9:16.78 run to take almost four seconds off Shannon Rowbury’s previous best of 9:20.25.

The four-time 1500m globalist medalist ran a 63-second final lap to finish more than 15-seconds ahead of Rachel Schneider, who crossed the line in 9:31.89.

Brenda Martinez completed the top three clocking 9:32.82 at the 109th edition of esteemed American track and field meet.

The 31 year-old also holds the American indoor record for the distance having run 9:18.35 in 2015.

It was Simpson’s sixth win at the annual Drake Relays and she now turns her attention to the 3000m at the opening Diamond League meet of the season in Doha this Friday.

Meanwhile, American rising star Sydney McLaughlin broke her own world junior record in the 400m hurdles at the American National Relay Championships in Fayetteville, Arkansas.

The 18-year-old ran 53.60 to take 0.22 seconds off best and goes to number four on American collegiate NCAA all-time list.