400 m, Men
| Competition | 1986 South American Athletics U18 Championships |
|---|---|
| Venue |
Comodore Rivadavia
 ARG
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 2 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Inaldo de Sena |  BRA |
50.63 | ||
| 🥈 | Antônio Ferreira | BRA |
51.44 | ||
| 🥉 | Santiago Ramírez |  URU |
51.62 |