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Date: 26 July 1980
Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Per Johansson | SWE | 51.42 |
| 2 | Sergei Krasiuk | URS | 51.81 |
| 3 | Graeme Brewer | AUS | 51.91 |
| 4 | Per Wikstroem | SWE | 52.15 |
| 5 | Mark Tonelli | AUS | 52.17 |
| 6 | Sergei Smiriagin | URS | 52.18 |
| 7 | Martin Smith | GBR | 52.41 |
| 8 | Jorge Luiz Fernandes | BRA | 52.91 |
| Rank | Name | Nation | Time |
| 1 | Joerg Woithe | GDR | 50.21 |
| 2 | Per Holmertz | SWE | 50.91 |
| 3 | Sergei Kopliakov | URS | 51.51 |
| 4 | Rene Ecuyer | FRA | 51.62 |
| 5 | Raffaele Franceschi | ITA | 51.87 |
| 6 | David Lopez-Zubero | ESP | 52.18 |
| 7 | Neil Brooks | AUS | 52.70 |
| 8 | Kees Vervoorn | NED | 52.73 |