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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Edwin Moses | USA | 48.51 |
| 2 | Tranel Hawkins | USA | 48.94 |
| 3 | Amadou Dia Ba | SEN | 49.44 |
| 4 | Michel Zimmermann | BEL | 49.79 |
| 5 | Simon Kitur | KEN | 49.80 |
| 6 | Uwe Schmitt | FRG | 50.08 |
| 7 | Greg Rolle | BAH | 50.16 |
| 8 | Antonio Ferreira | BRA | 50.70 |
| Rank | Name | Nation | Time |
| 1 | Danny Harris | USA | 48.92 |
| 2 | Sven Nylander | SWE | 49.03 |
| 3 | Harald Schmid | FRG | 49.04 |
| 4 | Henry Amike | NGR | 49.36 |
| 5 | Karl Smith | JAM | 49.58 |
| 6 | Franz Meier | SUI | 49.89 |
| 7 | Ryoichi Yoshida | JPN | 49.92 |
| 8 | Rik Tommelein | BEL | 50.06 |