| Final 21:30 | Team | time | L | | React. | bib | | 1. David Greene | GBR | 48.26s | 6 | | 0.153 | 441 | | 2. Javier Culson | PUR | 48.44s | 3 | | 0.190 | 865 | | 3. Louis Jacobus van Zyl | RSA | 48.80s | 8 | | 0.177 | 900 | | 4. Felix Sanchez | DOM | 48.87s | 7 | | 0.179 | 306 | | 5. Cornel Fredericks | RSA | 49.12s | 4 | | 0.170 | 882 | | 6. Bershawn Jackson | USA | 49.24s | 5 | | 0.151 | 1087 | | 7. Angelo Taylor | USA | 49.31s | 1 | | 0.155 | 1126 | | 8. Aleksandr Derevyagin | RUS | 49.32s | 2 | | 0.187 | 906 |
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| Semi-Finals - Tuesday 30.08 - First 2 and Best 2 progress. |
| 1. David Greene | GBR | 48.62s | 5 | | 0.147 | 2. | 441 | | 2. Felix Sanchez | DOM | 49.01s | 4 | | 0.199 | 6. | 306 | | 3. Jehue Gordon | TRI | 49.08s | 3 | | 0.167 | 9. | 1010 | | 4. Isa Phillips | JAM | 49.16s | 6 | | 0.269 | 10. | 599 | | 5. Andres Silva | URU | 49.63s | 7 | | 0.200 | 16. | 1058 | | 6. Emir Bekric | SRB | 49.94s | 1 | | 0.160 | 19. | 954 | | 7. Mahau Suguimati | BRA | 50.89s | 2 | | 0.174 | 23. | 203 | | 8. Kerron Clement | USA | 52.11s | 8 | | 0.162 | 24. | 1070 |
| 1. Javier Culson | PUR | 48.52s | 4 | | 0.203 | 1. | 865 | | 1. Bershawn Jackson | USA | 48.80s | 4 | | 0.174 | 3. | 1087 | | 2. Cornel Fredericks | RSA | 48.83s | 3 | | 0.143 | 4. | 882 | | 3. Angelo Taylor | USA | 48.86s | 6 | | 0.171 | 5. | 1126 | | 2. Luis Jacobus van Zyl | RSA | 49.05s | 6 | | 0.193 | 7. | 900 | | 3. Aleksandr Derevyagin | RUS | 49.07s | 7 | SB | 0.172 | 8. | 906 | | 4. Leford Green | JAM | 49.29s | 8 | | 0.208 | 11. | 595 | | 4. Jeshua Anderson | USA | 49.33s | 5 | | 0.172 | 12. | 1059 | | 5. Georg Fleischhauer | GER | 49.36s | 3 | | 0.144 | 13. | 479 | | 6. Nathan Woodward | GBR | 49.57s | 5 | | 0.150 | 14. | 465 | | 5. Jack Green | GBR | 49.62s | 2 | | 0.199 | 15. | 440 | | 7. Vincent Kiplangat Kosgei | KEN | 49.71s | 2 | | 0.176 | 17. | 657 | | 6. Stanislav Melnykov | UKR | 49.74s | 8 | | 0.183 | 18. | 1051 | | 7. Takayuki Kishimoto | JPN | 50.05s | 1 | | 0.148 | 20. | 621 | | 8. Omar Cisneros | CUB | 50.10s | 1 | | 0.189 | 21. | 277 | | 8. Josef Robertson | JAM | 50.39s | 7 | | 0.156 | 22. | 603 |
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| Heats - Monday 29.08 - First 4 and Best 4 progress. |
| Heat 1. 19:30 | Team | time | L | | React. | Rk. | bib | | Heat 1. 11:30 | Team | time | L | | React. | Rk. | bib | | 1. David Greene | GBR | 48.52s | 2 | | 0.152 | 1. | 441 | | 2. Cornel Fredericks | RSA | 48.52s | 5 | | 0.151 | 2. | 882 | | 3. Georg Fleischhauer | GER | 48.72s | 4 | PB | 0.176 | 5. | 479 | | 4. Emir Bekric | SRB | 49.67s | 1 | | 0.199 | 18. | 954 | | 5. Omar Cisneros | CUB | 49.69s | 3 | | 0.195 | 19. | 277 | | 6. Mahau Suguimati | BRA | 49.74s | 6 | | 0.198 | 20. | 203 |
| Heat 2. 19:38 | Team | time | L | | React. | Rk. | bib | | Heat 2. 11:38 | Team | time | L | | React. | Rk. | bib | | 1. Luis Jacobus van Zyl | RSA | 48.58s | 6 | | 0.198 | 3. | 900 | | 2. Isa Phillips | JAM | 48.64s | 3 | SB | 0.228 | 4. | 599 | | 3. Felix Sanchez | DOM | 48.74s | 4 | SB | 0.204 | 6. | 306 | | 4. Kerron Clement | USA | 48.91s | 5 | | 0.173 | 8. | 1070 | | 5. Vincent Kiplangat Kosgei | KEN | 49.49s | 2 | SB | 0.507 | 16. | 657 | | 6. Jorge Paula | POR | 49.82s | 7 | | 0.260 | 22. | 859 | | 7. Jamele Mason | PUR | 49.98s | 1 | | 0.181 | 25. | 868 |
| Heat 3. 19:46 | Team | time | L | | React. | Rk. | bib | | Heat 3. 11:46 | Team | time | L | | React. | Rk. | bib | | 1. Javier Culson | PUR | 48.95s | 3 | | 0.198 | 9. | 865 | | 2. Angelo Taylor | USA | 49.38s | 2 | | 0.189 | 12. | 1126 | | 3. Aleksandr Derevyagin | RUS | 49.43s | 1 | SB | 0.175 | 13. | 906 | | 4. Andres Silva | URU | 49.48s | 7 | | 0.283 | 15. | 1058 | | 5. Takayuki Kishimoto | JPN | 49.51s | 5 | | 0.155 | 17. | 621 | | 6. Zhilong Li | CHN | 50.44s | 6 | | 0.190 | 28. | 243 | | 7. Seung-yun Lee | KOR | 52.98s | 4 | | 0.199 | 34. | 692 |
| Heat 4. 11:54 | Team | time | L | | React. | Rk. | bib | | 1. Bershawn Jackson | USA | 49.82s | 5 | | 0.178 | 21. | 1087 | | 2. Jehue Gordon | TRI | 49.90s | 2 | | 0.193 | 24. | 1010 | | 3. Josef Robertson | JAM | 50.29s | 6 | | 0.214 | 26. | 603 | | 4. Jack Green | GBR | 50.39s | 4 | | 0.199 | 27. | 440 | | 5. Wen Cheng | CHN | 50.51s | 7 | | 0.307 | 29. | 236 | | 6. Kenneth Medwood | BIZ | 51.19s | 1 | | 0.183 | 32. | 182 | | 7. Takatoshi Abe | JPN | 51.90s | 3 | | 0.196 | 33. | 610 |
| Heat 5. 12:02 | Team | time | L | | React. | Rk. | bib | | 1. Jeshua Anderson | USA | 48.81s | 1 | | 0.172 | 7. | 1059 | | 2. Nathan Woodward | GBR | 49.06s | 7 | | 0.201 | 10. | 465 | | 3. Stanislav Melnykov | UKR | 49.24s | 5 | SB | 0.185 | 11. | 1051 | | 4. Leford Green | JAM | 49.45s | 6 | | 0.331 | 14. | 595 | | 5. Kurt Couto | MOZ | 49.86s | 2 | | 0.224 | 23. | 773 | | 6. Yuta Imazeki | JPN | 50.92s | 4 | | 0.226 | 30. | 616 | | 7. Jean Antonio Vieillesse | MRI | 51.02s | 3 | | 0.154 | 31. | 774 |
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