400 m, Men
| Competition | 1955 Pan American Games |
|---|---|
| Venue |
Ciudad de México
 MEX
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 1 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Lou Jones |  USA |
45.68 | ||
| 🥈 | Jim Lea | USA |
45.78 | ||
| 🥉 | J. W. Mashburn | USA |
46.44 |
| Competition | 1955 Pan American Games |
|---|---|
| Venue |
Ciudad de México
MEX
|
| Held | — |
| Status | Medal |
| Competitors | 3 |
| Countries | 1 |
| Pos | Athlete(s) | Country | Mark | ||
|---|---|---|---|---|---|
| 🥇 | Lou Jones | USA |
45.68 | ||
| 🥈 | Jim Lea | USA |
45.78 | ||
| 🥉 | J. W. Mashburn | USA |
46.44 |