400 m, Men
| Competition | 1958 South American Athletics Championships |
|---|---|
| Venue |
Montevideo
 URU
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 1 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Argemiro Roque |  BRA |
48.6 | ||
| 🥈 | Ulisses dos Santos | BRA |
49.1 | ||
| 🥉 | Geraldo Costa | BRA |
49.5 |