400 m, Men
| Competition | 1952 South American Athletics Championships |
|---|---|
| Venue |
Buenos Aires
 ARG
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 2 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Gustavo Ehlers |  CHI |
48.7 | ||
| 🥈 | Argemiro Roque |  BRA |
49.1 | ||
| 🥉 | Mário Do Nascimento | BRA |
49.7 |