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Date: 15 August 2008 / 16 August 2008 / 18 August 2008
Heats
Semi-finals
Final
| Rank | Name | Nation | Time |
| 1 | Angelo Taylor | USA | 47.25 |
| 2 | Kerron Clement | USA | 47.98 |
| 3 | Bershawn Jackson | USA | 48.06 |
| 4 | Danny McFarlane | JAM | 48.30 |
| 5 | L.J. van Zyl | RSA | 48.42 |
| 6 | Marek Plawgo | POL | 48.52 |
| 7 | Markino Buckley | JAM | 48.60 |
| 8 | Periklis Iakovakis | GRE | 49.96 |
| Semi-finals | |||
| 9 | Isa Phillips | JAM | 48.85 |
| 10 | Alwyn Myburgh | RSA | 49.16 |
| 11 | Alexander Derevyagin | RUS | 49.23 |
| 12 | Pieter de Villiers | RSA | 49.44 |
| 13 | Jonathan Williams | BIZ | 49.64 |
| 14 | Javier Culson | PUR | 49.85 |
| 15 | Mahau Suguimati | BRA | 50.16 |
| 16 | Bayano Kamani | PAN | 50.48 |
| Heats | |||
| 17 | Kenji Narisako | JPN | 49.63 |
| 18 | Meng Yan | CHN | 49.73 |
| 19 | Dai Tamesue | JPN | 49.82 |
| 20 | Edivaldo Monteiro | POR | 49.89 |
| 21 | Ibrahima Maiga | MLI | 50.57 |
| 22 | Felix Sanchez | DOM | 51.10 |
| 23 | Aleksey Pogorelov | KGZ | 51.47 |
| 23 | Mowen Boino | PNG | 51.47 |
| 25 | Harouna Garba | NIG | 55.14 |
| Did not finish | |||
| Yevgeniy Meleshenko | KAZ | ||