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Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Angelo Taylor | USA | 47.94 |
| 2 | Bershawn Jackson | USA | 48.02 |
| 3 | L.J. van Zyl | RSA | 48.57 |
| 4 | Marek Plawgo | POL | 48.75 |
| 5 | Isa Phillips | JAM | 48.85 |
| 6 | Alexander Derevyagin | RUS | 49.23 |
| 7 | Pieter de Villiers | RSA | 49.44 |
| 8 | Javier Culson | PUR | 49.85 |
| Rank | Name | Nation | Time |
| 1 | Kerron Clement | USA | 48.27 |
| 2 | Danny McFarlane | JAM | 48.33 |
| 3 | Markino Buckley | JAM | 48.50 |
| 4 | Periklis Iakovakis | GRE | 48.69 |
| 5 | Alwyn Myburgh | RSA | 49.16 |
| 6 | Jonathan Williams | BIZ | 49.64 |
| 7 | Mahau Suguimati | BRA | 50.16 |
| 8 | Bayano Kamani | PAN | 50.48 |