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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Alfons Brijdenbach | BEL | 45.46 |
| 2 | Richard Mitchell | AUS | 45.48 |
| 3 | David Jenkins | GBR | 45.59 |
| 4 | Michael Solomon | TTO | 45.61 |
| 5 | Dele Udo | NGR | 45.88 |
| 6 | Nikolai Chernetski | URS | 45.94 |
| 7 | Mauro Zuliani | ITA | 46.01 |
| 8 | Karel Kolar | TCH | 46.11 |
| Rank | Name | Nation | Time |
| 1 | Frank Schaffer | GDR | 45.47 |
| 2 | Viktor Markin | URS | 45.60 |
| 3 | Alberto Juantorena | CUB | 45.95 |
| 4 | Joseph Coombs | TTO | 45.96 |
| 5 | Viktor Burakov | URS | 45.97 |
| 6 | Didier Dubois | FRA | 46.72 |
| 7 | Jens Smedegaard Hansen | DEN | 47.00 |
| 8 | Alan Bell | GBR | 48.50 |