The US quartet of Brian Herron, Josephus Lyles, Zachary Shinnick and Sean Hooper after their 4x400m world U20 record at the Pan-American Junior Championships in Trujillo, Peru (© Talia Vargas/organisers)
The following world record has been 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
