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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Steven Lewis | USA | 44.35 |
| 2 | Danny Everett | USA | 44.36 |
| 3 | Darren Clark | AUS | 44.38 |
| 4 | Bert Cameron | JAM | 44.50 |
| 5 | Susumu Takano | JPN | 44.90 |
| 6 | Jens Carlowitz | GDR | 45.08 |
| 7 | Gerson de Souza | BRA | 45.27 |
| 8 | Tomasz Jedrusik | POL | 46.17 |
| Rank | Name | Nation | Time |
| 1 | Harry "Butch" Reynolds | USA | 44.33 |
| 2 | Ian Morris | TTO | 44.60 |
| 3 | Mohamed Al Malky | OMA | 44.69 |
| 4 | Innocent Egbunike | NGR | 44.74 |
| 5 | Thomas Schoenlebe | GDR | 44.90 |
| 6 | Howard Davis | JAM | 45.48 |
| 7 | Devon Morris | JAM | 45.68 |
| 8 | Brian Whittle | GBR | 46.07 |