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Summary
Heat 1
| Rank | Name | Nation | Time |
| 1 | Bershawn Jackson | USA | 49.20 |
| 2 | Pieter de Villiers | RSA | 49.24 |
| 3 | Mahau Suguimati | BRA | 49.45 |
| 4 | Jonathan Williams | BIZ | 49.61 |
| 5 | Kenji Narisako | JPN | 49.63 |
| 6 | Edivaldo Monteiro | POR | 49.89 |
| 7 | Harouna Garba | NIG | 55.14 |
| Rank | Name | Nation | Time |
| 1 | Angelo Taylor | USA | 48.67 |
| 2 | Danny McFarlane | JAM | 48.86 |
| 3 | Alwyn Myburgh | RSA | 48.92 |
| 4 | Bayano Kamani | PAN | 49.05 |
| 5 | Alexander Derevyagin | RUS | 49.19 |
| 6 | Ibrahima Maiga | MLI | 50.57 |
| Rank | Name | Nation | Time |
| 1 | Markino Buckley | JAM | 48.65 |
| 2 | L.J. van Zyl | RSA | 48.86 |
| 3 | Marek Plawgo | POL | 49.17 |
| 4 | Javier Culson | PUR | 49.60 |
| 5 | Meng Yan | CHN | 49.73 |
| 6 | Aleksey Pogorelov | KGZ | 51.47 |
| Rank | Name | Nation | Time |
| 1 | Kerron Clement | USA | 49.42 |
| 2 | Periklis Iakovakis | GRE | 49.50 |
| 3 | Isa Phillips | JAM | 49.55 |
| 4 | Dai Tamesue | JPN | 49.82 |
| 5 | Felix Sanchez | DOM | 51.10 |
| 6 | Mowen Boino | PNG | 51.47 |
| Did not finish | |||
| Yevgeniy Meleshenko | KAZ | ||