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Summary
Quarter-final 1
| Rank | Name | Nation | Time |
| 1 | Herman Frazier | USA | 46.52 |
| 2 | Alfons Brijdenbach | BEL | 46.56 |
| 3 | Karl Honz | FRG | 46.94 |
| 4 | Alfonso Diguida | ITA | 47.07 |
| 5 | Ossi Karttunen | FIN | 47.45 |
| 6 | Peter Grant | AUS | 47.69 |
| 7 | Alfred Daley | JAM | 48.46 |
| 8 | Glenn Bogue | CAN | 48.98 |
| Rank | Name | Nation | Time |
| 1 | Richard Mitchell | AUS | 45.76 |
| 2 | Alberto Juantorena | CUB | 45.92 |
| 3 | Jerzy Pietrzyk | POL | 46.30 |
| 4 | Bryan Saunders | CAN | 46.42 |
| 5 | Leighton Priestley | JAM | 46.45 |
| 6 | Mike Sands | BAH | 46.48 |
| 7 | Ivan Mangual | PUR | 46.56 |
| 8 | Charles Joseph | TTO | 46.61 |
| Rank | Name | Nation | Time |
| 1 | Michael Solomon | TTO | 45.83 |
| 2 | Jan Werner | POL | 45.88 |
| 3 | Maxie Parks | USA | 45.99 |
| 4 | Bernd Herrmann | FRG | 46.07 |
| 5 | Markku Kukkoaho | FIN | 46.24 |
| 6 | Eddy Gutierrez | CUB | 46.65 |
| 7 | Glendon Cohen | GBR | 47.67 |
| Did not start | |||
| Don Domansky | CAN | ||
| Rank | Name | Nation | Time |
| 1 | Fred Newhouse | USA | 45.97 |
| 2 | David Jenkins | GBR | 46.18 |
| 3 | Franz-Peter Hofmeister | FRG | 46.20 |
| 4 | Delmo Da Silva | BRA | 46.48 |
| 5 | Josko Alebic | YUG | 46.94 |
| 6 | Zbigniew Jaremski | POL | 47.10 |
| 7 | Fred Sowerby | ANT | 48.03 |
| 8 | Raymond Heerenveen | AHO | 48.88 |