400 m, Men
| Competition | 1999 South American Athletics U20 Championships |
|---|---|
| Venue |
Concepción
 CHI
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | William Hernández |  VEN |
47.28 | ||
| 🥈 | Jorge Maidana |  ARG |
48.10 | ||
| 🥉 | Guillermo Mayer | CHI |
48.24 |