400 m, Men
| Competition | 1990 South American Athletics U20 Championships |
|---|---|
| Venue |
Bogota
 COL
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 2 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Inaldo de Sena |  BRA |
46.89 | ||
| 🥈 | Nilton Messias | BRA |
47.04 | ||
| 🥉 | Guillermo Cacián |  ARG |
48.03 |