Katsiaryna Artsiukh of Belarus ran a World Junior-leading 56.16 in the 400m hurdles, then hopped a few more hurdles as she took her lap of honor.
Running in lane 3, Artsiukh trailed the aggressive start of American Evonne Britton who was running blind in Lane 8. Britton held the lead until the race reached the homestretch, but just as she began to visibly lose steam, Artsiukh was in full flight. Artsiukh took the lead in the gap before the final hurdle and held it through to the end.
Behind her, Russia's Vera Rudakova put on a furious charge to catch the failing Britton after the last hurdle, and took silver in 57.16. Britton saved bronze in 57.32, but barely managed that as Japan's Shiori Miki was right behind in 57.35, a Japanese national junior record.
Rudakova and Britton both ran PBs, as did nearly everyone in the race with the exception of USA's Christina Holland in lane 1.