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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | John Akii-Bua | UGA | 49.25 |
| 2 | Ralph Mann | USA | 49.53 |
| 3 | David Hemery | GBR | 49.66 |
| 4 | Rainer Schubert | FRG | 49.80 |
| 5 | Rolf Ziegler | FRG | 49.88 |
| 6 | Ivan Danis | TCH | 50.01 |
| 7 | Victor Savchenko | URS | 50.28 |
| 8 | Jean-Pierre Corval | FRA | 50.75 |
| Rank | Name | Nation | Time |
| 1 | James Seymour | USA | 49.33 |
| 2 | Evgeniy Gavrilenko | URS | 49.34 |
| 3 | Yuri Zorin | URS | 49.60 |
| 4 | Stavros Tziortzis | GRE | 50.06 |
| 5 | Tadeusz Kulczycki | POL | 50.80 |
| 6 | Gary Knoke | AUS | 52.79 |
| Did not finish | |||
| Christian Rudolph | GDR | ||
| Dieter-Wolfgang Buttner | FRG | ||