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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Richard Mitchell | AUS | 45.73 |
| 2 | Alfons Brijdenbach | BEL | 45.88 |
| 3 | Jens Smedegaard Hansen | DEN | 45.89 |
| 4 | Dele Udo | NGR | 46.18 |
| 5 | Francis Demarthon | FRA | 46.38 |
| 6 | Josip Alebic | YUG | 46.60 |
| 7 | Charles Lupiya | ZAM | 47.67 |
| 8 | Stefano Malinverni | ITA | 47.79 |
| Rank | Name | Nation | Time |
| 1 | Frank Schaffer | GDR | 46.15 |
| 2 | Alberto Juantorena | CUB | 46.23 |
| 3 | Viktor Burakov | URS | 46.23 |
| 4 | Didier Dubois | FRA | 46.60 |
| 5 | Silver Ayoo | UGA | 47.03 |
| 6 | Bert Cameron | JAM | 47.31 |
| 7 | Glendon Cohen | GBR | 47.35 |
| 8 | Jacques Borlee | BEL | 47.73 |
| Rank | Name | Nation | Time |
| 1 | Viktor Markin | URS | 45.58 |
| 2 | Joseph Coombs | TTO | 45.81 |
| 3 | Mauro Zuliani | ITA | 45.93 |
| 4 | Alan Bell | GBR | 46.17 |
| 5 | Andrzej Stepien | POL | 46.31 |
| 6 | Eddy de Leeuw | BEL | 46.47 |
| 7 | Derrick Peynado | JAM | 46.50 |
| 8 | Marcel Klarenbeek | NED | 46.81 |
| Rank | Name | Nation | Time |
| 1 | David Jenkins | GBR | 45.99 |
| 2 | Michael Solomon | TTO | 46.12 |
| 3 | Karel Kolar | TCH | 46.27 |
| 4 | Nikolai Chernetski | URS | 46.30 |
| 5 | Roberto Tozzi | ITA | 46.73 |
| 6 | Hope Ezeigbo | NGR | 46.88 |
| 7 | Ian Stapleton | JAM | 47.64 |
| 8 | Hussain Ali Nsayyif | IRQ | 48.50 |