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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Ardalion Ignatyev | URS | 46.8 |
| 2 | Malcolm Spence | RSA | 47.2 |
| 3 | Louis Jones | USA | 47.3 |
| 4 | Melville Spence | JAM | 47.5 |
| 5 | Peter Higgins | GBR | 47.7 |
| 6 | Ivan Rodriguez | PUR | 47.7 |
| Rank | Name | Nation | Time |
| 1 | Charles Jenkins | USA | 46.1 |
| 2 | Voitto Hellsten | FIN | 46.1 |
| 3 | Karl-Friedrich Haas | GER | 46.2 |
| 4 | Kevan Gosper | AUS | 46.2 |
| 5 | John Salisbury | GBR | 47.3 |
| 6 | Malcolm Spence | JAM | 47.4 |