400 m, Men
| Competition | 1961 South American Athletics Junior Championships |
|---|---|
| Venue |
Santa Fé
 ARG
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Mario López | ARG |
50.7 | ||
| 🥈 | Jaime Vega |  CHI |
50.9 | ||
| 🥉 | Jorge Vilaboa |  URU |
51.0 |