USA’s 4×400 under 20 world record ratified

World U20 record

Men’s 4x400m: 3:00.33 USA (Zachary Shinnick, Josephus Lyles, Brian Herron, Sean Hooper) Trujillo 23 July 2017

Previous: 3:01.09 USA (Brandon Johnson, LaShawn Merritt, Jason Craig, Kerron Clement) Grosseto 18 July 2004 IAAF

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