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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Derrick Adkins | USA | 47.76 |
| 2 | Sven Nylander | SWE | 48.21 |
| 3 | Fabrizio Mori | ITA | 48.43 |
| 4 | Eronilde de Araujo | BRA | 48.45 |
| 5 | Dusan Kovacs | HUN | 48.57 |
| 6 | Ken Harnden | ZIM | 48.61 |
| 7 | Jon Ridgeon | GBR | 49.43 |
| 8 | Bryan Bronson | USA | 50.32 |
| Rank | Name | Nation | Time |
| 1 | Calvin Davis | USA | 47.91 |
| 2 | Everson Teixeira | BRA | 48.28 |
| 3 | Samuel Matete | ZAM | 48.28 |
| 4 | Rohan Robinson | AUS | 48.28 |
| 5 | Neil Gardner | JAM | 48.30 |
| 6 | Laurent Ottoz | ITA | 48.52 |
| 7 | Ibou Faye | SEN | 48.84 |
| 8 | Marc Dollendorf | BEL | 48.91 |