- Male 400 M Dash (17)
- 8 Advance: Top 2 Each Heat plus Next 2 Best Times
- Friday 7/21/2017 - 10:40
- Jr. World:43.879/28/1988SteveLEWIS, USA
- PanAm U20:45.141995ObeaMOORE, USA
- Heat 1 Prelims
- 2Carlos Zavalaga Cuadros (19)Peru49.08
- 3Carlos X Betancourt Moncayo (18)Ecuador48.96
- 4Jacob ST Clair (19)Trin & Tob46.13
- 5Jamal Walton (19)Cayman Is.45.70
- 6Miquel M Shepper (18)Surinam47.90
- 7Austin Cole (19)Canada47.46
- Heat 2 Prelims
- 2Edisson S Acuña Mena (19)Ecuador48.35
- 3Josephus Lyles (19)United States45.42
- 4Chantz Sawyers (18)Jamaica46.31
- 5Quinn Litherland (18)Canada47.57
- 6Jeikob Monge Calderon (18)Costa RicaNT
- 7Edgar I Ramirez Rios (19)Mexico47.22
- Heat 3 Prelims
- 2Mateo Pascual (18)Uruguay48.10
- 3Anthony Carpenter (18)Jamaica46.53
- 4Luis E Charles (19)Dom. Rep.46.91
- 5Judah Taylor (19)Trin & Tob47.46
- 6Zachary Shinnick (18)United States45.20
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