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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Amadou Gakou | SEN | 45.1 |
| 2 | Ronald Freeman | USA | 45.4 |
| 3 | Andrzej Badenski | POL | 45.4 |
| 4 | Tegegne Bezabeh | ETH | 45.5 |
| 5 | Samuel Bugri | GHA | 45.9 |
| 6 | Helmar Muller | FRG | 46.2 |
| 7 | Claver Kamanya | TAN | 46.2 |
| 8 | Wolfgang Muller | GDR | 48.3 |
| Rank | Name | Nation | Time |
| 1 | Lee Evans | USA | 44.8 |
| 2 | Larry James | USA | 44.9 |
| 3 | Martin Jellinghaus | FRG | 44.9 |
| 4 | Amos Omolo | UGA | 45.4 |
| 5 | Jan Werner | POL | 45.7 |
| 6 | Munyoro Nyamau | KEN | 46.3 |
| 7 | Jean-Claude Nallet | FRA | 49.0 |
| 8 | Ross MacKenzie | CAN | 49.2 |