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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Vincent Matthews | USA | 44.94 |
| 2 | Karl Honz | FRG | 45.32 |
| 3 | John Smith | USA | 45.46 |
| 4 | Charles Asati | KEN | 45.47 |
| 5 | David Jenkins | GBR | 45.91 |
| 6 | Tegegne Bezabeh | ETH | 45.98 |
| 7 | Georg Nuckles | FRG | 46.28 |
| 8 | Andrzej Badehski | POL | 46.38 |
| Rank | Name | Nation | Time |
| 1 | Julius Sang | KEN | 45.30 |
| 2 | Horst-Rudiger Schloske | FRG | 45.62 |
| 3 | Wayne Collett | USA | 45.77 |
| 4 | Markku Kukkoaho | FIN | 46.02 |
| 5 | Alberto Juantorena | CUB | 46.07 |
| 6 | Jan Werner | POL | 46.26 |
| 7 | Martin Reynolds | GBR | 46.71 |
| Did not start | |||
| Zbigniew Jaremski | POL | ||