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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Steven Lewis | USA | 44.50 |
| 2 | Roberto Hernandez | CUB | 44.72 |
| 3 | Ibrahim Ismail | QAT | 45.01 |
| 4 | Susumu Takano | JPN | 45.09 |
| 5 | Sunday Bada | NGR | 45.36 |
| 6 | Troy Douglas | BER | 45.59 |
| 7 | Simon Kemboi | KEN | 45.93 |
| Did not finish | |||
| Derek Redmond | GBR | ||
| Rank | Name | Nation | Time |
| 1 | Quincy Watts | USA | 43.71 |
| 2 | Samson Kitur | KEN | 44.18 |
| 3 | Ian Morris | TTO | 44.21 |
| 4 | David Grindley | GBR | 44.47 |
| 5 | Roger Black | GBR | 44.72 |
| 6 | Benyounes Lahlou | MAR | 45.49 |
| 7 | Bobang Phiri | RSA | 45.59 |
| 8 | Danny Everett | USA | 56.61 |