400 m, Men
| Competition | 2003 South American Athletics U20 Championships |
|---|---|
| Venue |
Guayaquil
 ECU
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 3 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Andrés Silva |  URU |
46.54 | ||
| 🥈 | Thiago Chyaromont |  BRA |
47.37 | ||
| 🥉 | Francisco Aguirre | ECU |
47.56 |