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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Wayne Collett | USA | 45.80 |
| 2 | Alberto Juantorena | CUB | 45.96 |
| 3 | Jan Werner | POL | 46.02 |
| 4 | Martin Reynolds | GBR | 46.11 |
| 5 | Charles Joseph | TTO | 46.14 |
| 6 | Robert Ojo | NGR | 46.73 |
| 7 | Omar Ghizlat | MAR | 46.84 |
| 8 | Samuel Bugri | GHA | 47.34 |
| Rank | Name | Nation | Time |
| 1 | Horst-Rudiger Schloske | FRG | 45.41 |
| 2 | Vincent Matthews | USA | 45.62 |
| 3 | Tegegne Bezabeh | ETH | 45.97 |
| 4 | Gilles Bertould | FRA | 46.14 |
| 5 | Wickrema Wimaladase | SRI | 46.50 |
| 6 | Leighton Priestley | JAM | 47.76 |
| 7 | Arthur Cooper | TTO | 48.29 |
| 8 | Reza Entezari | IRI | 48.69 |
| Rank | Name | Nation | Time |
| 1 | David Jenkins | GBR | 45.99 |
| 2 | John Smith | USA | 46.04 |
| 3 | Markku Kukkoaho | FIN | 46.11 |
| 4 | Hezekiah Nyamau | KEN | 46.80 |
| 5 | Bruce Ijirighwo | NGR | 46.81 |
| 6 | Daniel Velasques | FRA | 46.91 |
| 7 | Amadou Gakou | SEN | 46.96 |
| 8 | Hussein Angelo Nimir | SUD | 47.33 |
| Rank | Name | Nation | Time |
| 1 | Karl Honz | FRG | 45.87 |
| 2 | Julius Sang | KEN | 45.92 |
| 3 | Zbigniew Jaremski | POL | 46.52 |
| 4 | Anders Faager | SWE | 46.54 |
| 5 | Francis Kerbiriou | FRA | 46.63 |
| 6 | Yoshiharu Tomonaga | JPN | 46.92 |
| 7 | Gary Armstrong | GBR | 47.10 |
| 8 | Kyriakos Onissiforou | GRE | 47.22 |
| Rank | Name | Nation | Time |
| 1 | Charles Asati | KEN | 46.04 |
| 2 | Andrzej Badehski | POL | 46.19 |
| 3 | Georg Nuckles | FRG | 46.30 |
| 4 | Claver Kamanya | TAN | 46.55 |
| 5 | Mulugetta Tadesse | ETH | 46.85 |
| 6 | Bjarni Stefansson | ISL | 46.92 |
| 7 | Eric Phillips | VEN | 46.97 |
| Did not start | |||
| Fernando Acevedo | PER | ||