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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Roberto Frinolli | ITA | 49.2 |
| 2 | Geoff Vanderstock | USA | 49.2 |
| 3 | John Sherwood | GBR | 49.3 |
| 4 | Rainer Schubert | FRG | 49.3 |
| 5 | Juan Carlos Dyrzka | ARG | 49.8 |
| 6 | Jaakko Tuominen | FIN | 50.8 |
| 7 | John Cooper | GBR | 50.8 |
| 8 | Victor Maldonado | VEN | 52.2 |
| Rank | Name | Nation | Time |
| 1 | Gerhard Hennige | FRG | 49.1 |
| 2 | Ronald Whitney | USA | 49.2 |
| 3 | David Hemery | GBR | 49.3 |
| 4 | Viacheslav Skomarokhov | URS | 49.6 |
| 5 | Gary Knoke | AUS | 49.6 |
| 6 | Robert Poirier | FRA | 51.2 |
| 7 | Roger Johnson | NZL | 51.8 |
| 8 | Mamadou Sarr | SEN | 52.1 |