Semi-Finals: Friday, July 8, 4:31 p.m. PT
Final: Sunday, July 10, 4:03 p.m. PT
If it weren't for an upstart named Sydney McLaughlin, Anna Cockrell would likely be a national champion by now. Instead, the national record holder from New Jersey has helped push Cockrell to marks on the all-time list: her new best effort of 55.89 is the fourth-fastest ever for a high school girl. She also ties for No. 10 all-time in the 100m hurdles with her PR of 13.17. Cockrell's 400m hurdles time ranks No. 18 in the nation this year.
Anna Cockrell talks about racing vs. the best high school girls 100m hurdles field in prep history: