| Final 20:45 | Team | time | L | | React. | bib | | 1. Kirani James | GRN | 44.60s | 5 | PB | 0.137 | 525 | | 2. LaShawn Merritt | USA | 44.63s | 4 | | 0.263 | 1099 | | 3. Kevin Borlee | BEL | 44.90s | 6 | | 0.182 | 171 | | 4. Jermaine Gonzales | JAM | 44.99s | 3 | | 0.138 | 594 | | 5. Jonathan Borlee | BEL | 45.07s | 8 | | 0.160 | 170 | | 6. Rondell Bartholomew | GRN | 45.45s | 2 | | 0.314 | 524 | | 7. Tabarie Henry | ISV | 45.55s | 7 | | 0.167 | 565 | | 8. Femi Ogunode | QAT | 45.55s | 1 | | 0.170 | 874 |
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| Semi-Finals - Monday 29.08 - First 2 and Best 2 progress. |
| Semi 1. 20:00 | Team | time | L | | React. | Rk. | bib | | 1. LaShawn Merritt | USA | 44.76s | 6 | | 0.284 | 1. | 1099 | | 2. Kevin Borlee | BEL | 45.02s | 3 | | 0.156 | 3. | 171 | | 3. Rabah Yousif | SUD | 45.43s | 4 | | 0.161 | 8. | 963 | | 4. Renny Quow | TRI | 45.72s | 5 | | 0.189 | 13. | 1013 | | 5. Ramon Miller | BAH | 45.88s | 7 | | 0.235 | 16. | 158 | | 6. Yuzo Kanemaru | JPN | 46.11s | 8 | | 0.171 | 20. | 618 | | 7. William Collazo | CUB | 46.13s | 1 | | 0.145 | 21. | 278 | | 8. Erison Hurtault | DMA | 46.41s | 2 | | 0.163 | 23. | 303 |
| Semi 2. 20:08 | Team | time | L | | React. | Rk. | bib | | 1. Kirani James | GRN | 45.20s | 4 | | 0.174 | 6. | 525 | | 2. Tabarie Henry | ISV | 45.53s | 7 | | 0.199 | 10. | 565 | | 3. Chris Brown | BAH | 45.54s | 3 | | 0.159 | 11. | 154 | | 4. Jamaal Torrance | USA | 45.73s | 6 | | 0.265 | 14. | 1131 | | 5. Nery Brenes | CRC | 45.93s | 2 | | 0.176 | 17. | 271 | | 6. Marcin Marciniszyn | POL | 45.94s | 8 | | 0.191 | 18. | 840 | | 7. Martyn Rooney | GBR | 46.09s | 5 | | 0.198 | 19. | 456 | | 8. Riker Hylton | JAM | 46.99s | 1 | | 0.202 | 24. | 596 |
| Semi 3. 20:16 | Team | time | L | | React. | Rk. | bib | | 1. Jermaine Gonzales | JAM | 44.99s | 5 | | 0.160 | 2. | 594 | | 2. Jonathan Borlee | BEL | 45.14s | 3 | | 0.155 | 4. | 170 | | 3. Rondell Bartholomew | GRN | 45.17s | 4 | | 0.192 | 5. | 524 | | 4. Femi Ogunode | QAT | 45.41s | 8 | SB | 0.187 | 7. | 874 | | 5. Greg Nixon | USA | 45.51s | 6 | | 0.232 | 9. | 1106 | | 6. Pavel Trenikhin | RUS | 45.68s | 2 | | 0.230 | 12. | 934 | | 7. Demetrius Pinder | BAH | 45.87s | 1 | | 0.141 | 15. | 160 | | 8. Oscar Pistorius | RSA | 46.19s | 7 | | 0.294 | 22. | 896 |
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| Heats - Sunday 28.08 - First 4 and Best 4 progress. |
| Heat 1. 11:15 | Team | time | L | | React. | Rk. | bib | | 1. Rondell Bartholomew | GRN | 44.82s | 3 | | 0.183 | 3. | 524 | | 2. Renny Quow | TRI | 44.84s | 1 | SB | 0.168 | 4. | 1013 | | 3. Greg Nixon | USA | 45.16s | 4 | | 0.193 | 7. | 1106 | | 4. Tabarie Henry | ISV | 45.22s | 5 | | 0.146 | 10. | 565 | | 5. Riker Hylton | JAM | 45.54s | 2 | | 0.212 | 21. | 596 | | 6. Mathieu Gnanligo | BEN | 47.01s | 6 | | 0.202 | 28. | 178 | | 7. Nelson Stone | PNG | 47.86s | 7 | | 0.202 | 30. | 822 | | 8. Kerfalla Camara | GUI | 49.74s | 8 | PB | 0.192 | 35. | 527 |
| Heat 2. 11:23 | Team | time | L | | React. | Rk. | bib | | 1. Jermaine Gonzales | JAM | 45.12s | 7 | | 0.177 | 5. | 594 | | 2. Jamaal Torrance | USA | 45.44s | 5 | | 0.161 | 16. | 1131 | | 3. Marcin Marciniszyn | POL | 45.51s | 6 | | 0.183 | 18. | 840 | | 4. Demetrius Pinder | BAH | 45.53s | 2 | | 0.154 | 20. | 160 | | 5. Erison Hurtault | DMA | 46.10s | 1 | | 0.168 | 24. | 303 | | 6. Nicolau Palanca | ANG | 49.37s | 4 | SB | 0.300 | 34. | 110 | | 7. Ak. Hafiy Tajuddin Rositi | BRU | 50.12s | 8 | | 0.173 | 36. | 211 |
| Heat 3. 11:31 | Team | time | L | | React. | Rk. | bib | | 1. LaShawn Merritt | USA | 44.35s | 7 | WL | 0.267 | 1. | 1099 | | 2. Kevin Borlee | BEL | 44.77s | 2 | | 0.177 | 2. | 171 | | 3. Rabah Yousif | SUD | 45.20s | 3 | | 0.149 | 9. | 963 | | 4. Yuzo Kanemaru | JPN | 45.51s | 4 | | 0.154 | 18. | 618 | | 5. Pavel Trenikhin | RUS | 45.55s | 5 | PB | 0.190 | 22. | 934 | | 6. Arnold Sorina | VAN | 48.76s | 1 | SB | 0.247 | 32. | 1140 | | -. Arismendy Peguero | DOM | DNS | 6 | | | | 305 | | -. Gary Kikaya | COD | DNS | 8 | | | | 260 |
| Heat 4. 11:39 | Team | time | L | | React. | Rk. | bib | | 1. Kirani James | GRN | 45.12s | 7 | | 0.164 | 5. | 525 | | 2. Jonathan Borlee | BEL | 45.16s | 8 | | 0.168 | 7. | 170 | | 3. Ramon Miller | BAH | 45.31s | 3 | SB | 0.156 | 13. | 158 | | 4. William Collazo | CUB | 45.89s | 2 | | 0.183 | 23. | 278 | | 5. Bonggo Park | KOR | 46.42s | 4 | SB | 0.162 | 25. | 696 | | 6. Pako Seribe | BOT | 46.97s | 6 | | 0.196 | 27. | 190 | | 7. Augusto Stanley | PAR | 47.31s | 5 | | 0.179 | 29. | 815 | | 8. Bahaa Al Farra | PLE | 49.04s | 1 | PB | 0.232 | 33. | 820 |
| Heat 5. 11:47 | Team | time | L | | React. | Rk. | bib | | 1. Chris Brown | BAH | 45.29s | 2 | | 0.166 | 11. | 154 | | 2. Martyn Rooney | GBR | 45.30s | 3 | SB | 0.178 | 12. | 456 | | 3. Oscar Pistorius | RSA | 45.39s | 8 | | 0.212 | 14. | 896 | | 4. Femi Ogunode | QAT | 45.42s | 7 | SB | 0.196 | 15. | 874 | | 5. Nery Brenes | CRC | 45.47s | 1 | | 0.183 | 17. | 271 | | 6. Tony McQuay | USA | 46.76s | 6 | | 0.175 | 26. | 1097 | | 7. Ahmed Mohamed Al-Merjabi | OMA | 47.99s | 4 | | 0.174 | 31. | 811 | | -. Abdou Razack Rabo Samma | NIG | DQ | 5 | | 0.214 | | 794 |
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