The 22-year-old Okolo, who runs for University of Texas, ran a phenomenal 49.71 seconds and set the fastest time ever in NCAA history. Okolo's time is also the second fastest time in the world this year.
Okolo was part of the USA's women's 4x400m team that won gold medal at the IAAF World Indoor Championships in March in Portland.
Women's 400m Top Results: See full results here.
Name Year School Finals H# =================================================================== Finals 1 Courtney Okolo Texas 49.71S 2 2 Chrisann Gordon Texas 51.03 2 3 Felecia Majors Tennessee 52.19 2 4 Georganne Moline Nike 52.39 2 5 Mariam Kromah Southern Miss. 52.73 2 6 Cassandra Tate Tiger Olympians 52.98 2 7 Deja Parrish Clemson 53.15 1 8 Travia Jones LSU 53.25 1 9 Shayla Luckett Miss State 53.28 1 10 Layla White Tennessee 53.44 1