| Final | Team | time | L | Q. | | 1. LaShawn Merritt | USA | 43.75 | 4 | 6. 1. | | 2. Jeremy Wariner | USA | 44.74 | 7 | 15.2. | | 3. David Neville | USA | 44.80 | 9 | 13.9. | | 4. Christopher Brown | BAH | 44.84 | 5 | 1. 3. | | 5. Leslie Djhone | FRA | 45.11 | 6 | 8. 6. | | 6. Martyn Rooney | GBR | 45.12 | 8 | 7. 4. | | 7. Renny Quow | TRT | 45.22 | 2 | 9. 7. | | 8. Johan Wissman | SWE | 45.39 | 3 | 3. 5. |
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| Semi 1 | Team | time | L | Rk. | | 1. Jeremy Wariner | USA | 44.15s | 6 | 2. | | 2. Christopher Brown | BAH | 44.59s | 5 | 3. | | 3. Kevin Borlee | BEL | 44.88s | 3 | 8. | | 4. Nery Brenes | CRC | 44.94s | 7 | 10. | | 5. Saul Weipogwa | NGR | 45.02s | 4 | 12. | | 6. Williams Collazo | CUB | 45.06s | 2 | 13. | | 7. Tabarie Henry | UVI | 45.19s | 8 | 17. | | 8. Claudio Licciardello | ITA | 45.64s | 9 | 23. |
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| Semi 2 | Team | time | L | Rk. | | 1. Leslie Djhone | FRA | 44.79s | 6 | 6. | | 2. David Neville | USA | 44.91s | 4 | 9. | | 3. Joel Milburn | AUS | 45.06s | 5 | 13. | | 4. Ricardo Chambers | JAM | 45.09s | 9 | 15. | | 5. Jonathan Borlee | BEL | 45.11s | 3 | 16. | | 6. Godday James | NGR | 45.24s | 8 | 18. | | 7. Andretti Bain | BAH | 45.52s | 2 | 19. | | 8. Andrew Steele | GBR | 45.59s | 7 | 22. |
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| Semi 3 | Team | time | L | Rk. | | 1. LaShawn Merritt | USA | 44.12s | 7 | 1. | | 2. Martyn Rooney | GBR | 44.60s | 6 | 4. | | 3. Johan Wissman | SWE | 44.64s | 8 | 5. | | 4. Renny Quow | TRT | 44.82s | 5 | 7. | | 5. Senga Gary Kikaya | CDR | 44.94s | 2 | 10. | | 6. Michael Mathieu | BAH | 45.56s | 9 | 20. | | 7. Sean Wroe | AUS | 45.56s | 4 | 21. | | 8. Cedric van Branteghem | BEL | 45.81s | 3 | 24. |
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| Heat 1 1..08 | Team | time | L | Rk. | | 1. Leslie Djhone | FRA | 45.12s | 4 | 8. | | 2. David Neville | USA | 45.22s | 5 | 13. | | 3. Williams Collazo | CUB | 45.37s | 6 | 20. | | 4. Kevin Borlee | BEL | 45.43s | 8 | 21. | | 5. Denis Alexeev | RUS | 45.52s | 9 | 23. | | 6. Young Talkmore Nyongani | ZIM | 45.89s | 3 | 30. | | 7. Eric Milazar | MRI | 46.06s | 7 | 33. | | 8. Gakologelwang Masheto | BOT | 46.29s | 2 | 38. |
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| Heat 2 1..08 | Team | time | L | Rk. | | 1. Christopher Brown | BAH | 44.79s | 6 | 1. | | 2. Joel Milburn | AUS | 44.80s | 7 | 2. | | 3. Johan Wissman | SWE | 44.81s | 4 | 3. | | 4. Senga Gary Kikaya | CDR | 44.89s | 5 | 4. | | 5. Sanjay Ayre | JAM | 45.66s | 8 | 27. | | 6. Arismendy Peguero | DCA | 46.28s | 9 | 36. | | 7. Ivano Bucci | SMR | 48.54s | 3 | 53. | | 8. Xiaosheng Liu | CHN | 53.11s | 2 | 55. |
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| Heat 3 1..08 | Team | time | L | Rk. | | 1. Nery Brenes | CRC | 45.36s | 8 | 18. | | 2. Godday James | NGR | 45.49s | 3 | 22. | | 3. Andretti Bain | BAH | 45.96s | 9 | 31. | | 4. Niko Verekauta | FIJ | 46.32s | 7 | 40. | | 5. Fernando Almeida | BRA | 46.60s | 6 | 46. | | 6. Lewis Banda | ZIM | 46.76s | 2 | 47. | | 7. Vincent Mumo Kiilu | KEN | 46.79s | 4 | 48. | | 8. Nagm Eldin Ali | SUD | 47.12s | 5 | 50. |
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| Heat 4 1..08 | Team | time | L | Rk. | | 1. Martyn Rooney | GBR | 45.00s | 7 | 7. | | 2. Sean Wroe | AUS | 45.17s | 8 | 10. | | 3. Ricardo Chambers | JAM | 45.22s | 5 | 13. | | 4. Erison Hurtault | DCA | 46.10s | 3 | 34. | | 5. Andres Bayron Silva | URU | 46.34s | 9 | 41. | | 6. Rudolf Gotz | CZE | 46.38s | 2 | 42. | | 7. Yuzo Kanemaru | JPN | 46.39s | 6 | 43. | | -. California Molefe | BOT | | 4 | |
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| Heat 5 1..08 | Team | time | L | Rk. | | 1. LaShawn Merritt | USA | 44.96s | 2 | 6. | | 2. Saul Weipogwa | NGR | 45.19s | 7 | 12. | | 3. Claudio Licciardello | ITA | 45.25s | 8 | 16. | | 4. Jonathan Borlee | BEL | 45.25s | 3 | 17. | | 5. Ato Modibo | TRT | 45.63s | 6 | 26. | | 6. Alleyne Francique | GRE | 46.15s | 9 | 35. | | 7. Geiner Mosquera | COL | 46.59s | 5 | 45. | | 8. Siraj Williams | LBR | 47.89s | 4 | 52. |
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| Heat 6 1..08 | Team | time | L | Rk. | | 1. Andrew Steele | GBR | 44.94s | 7 | 5. | | 2. Renny Quow | TRT | 45.13s | 5 | 9. | | 3. Michael Mathieu | BAH | 45.17s | 6 | 10. | | 4. Michael Blackwood | JAM | 45.56s | 8 | 25. | | 5. Tyler Christopher | CAN | 45.67s | 2 | 28. | | 6. Joel Phillip | GRE | 46.30s | 3 | 39. | | 7. Felix Martinez | PRO | 46.46s | 9 | 44. | | 8. Daniel Dabrowski | POL | 47.83s | 4 | 51. |
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| Heat 7 1..08 | Team | time | L | Rk. | | 1. Jeremy Wariner | USA | 45.23s | 9 | 15. | | 2. Tabarie Henry | UVI | 45.36s | 6 | 18. | | 3. Cedric van Branteghem | BEL | 45.54s | 2 | 24. | | 4. David Gillick | IRE | 45.83s | 4 | 29. | | 5. Maksim Dyldin | RUS | 46.03s | 5 | 32. | | 6. Mykhaylo Knysh | UKR | 46.28s | 3 | 36. | | 7. Mathieu Gnanligo Fousseni | BEN | 47.10s | 7 | 49. | | 8. Naiel Santiago D'Almeida | STP | 49.08s | 8 | 54. |
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