| Final 21:50 | time | L | | 1. Bershawn Jackson |  USA | 47.30s | 6 | | 2. James Carter | USA | 47.43s | 3 | | 3. Dai Tamesue |  JPN | 48.10s | 7 | | 4. Kerron Clement | USA | 48.18s | 1 | | 5. Naman Keita |  FRA | 48.28s | 8 | | 6. L.J. van Zyl |  RSA | 48.54s | 4 | | 7. Bayano Kamani |  PAN | 50.18s | 5 | | -. Felix Sanchez |  DOM | DNF | 2 |
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| Standard A | 49.20s | Standard B | 49.80s |
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| Semi 1 21:00h | time | L | | 1. James Carter | USA | 47.78s | 4 | | 2. Bayano Kamani | PAN | 47.84s | 6 | | 3. Felix Sanchez | DOM | 48.24s | 5 | | 4. Dai Tamesue | JPN | 48.46s | 3 | | 5. Pieter de Villiers | RSA | 49.75s | 7 | | 6. Dean Griffiths |  JAM | 49.89s | 1 | | 7. Eduardo Ivan Rodriguez |  ESP | 49.97s | 8 | | 8. Christian Duma |  GER | 50.25s | 2 |
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| Semi 2 21:08h | time | L | | 1. L.J. van Zyl | RSA | 48.16s | 3 | | 2. Kerron Clement | USA | 48.49s | 5 | | 3. Kenji Narisako | JPN | 49.00s | 1 | | 4. Yevgeniy Meleshenko |  KAZ | 49.22s | 4 | | 5. Danny Mcfarlane | JAM | 49.41s | 6 | | 6. Rhys Williams |  GBR | 49.67s | 8 | | 7. Ari-Pekka Lattu |  FIN | 49.81s | 7 | | -. Yacnier Luis |  CUB | DQ | 2 |
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| Semi 3 21:16h | time | L | | 1. Bershawn Jackson | USA | 48.19s | 3 | | 2. Naman Keita | FRA | 48.60s | 5 | | 3. Kemel Thompson | JAM | 48.64s | 6 | | 4. Hadi Soua'an Al-Somaily |  KSA | 49.09s | 2 | | 5. Periklis Iakovakis |  GRE | 49.28s | 4 | | 6. Sergio Hierrezuelo | CUB | 49.66s | 1 | | 7. Gianni Carabelli |  ITA | 49.77s | 7 | | 8. Llewellyn Herbert | RSA | 50.69s | 8 |
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| Heat 1 13:50h | time | L | | 1. Kerron Clement | USA | 48.98s | 2 | | 2. Danny Mcfarlane | JAM | 49.37s | 8 | | 3. Pieter de Villiers | RSA | 49.81s | 7 | | 4. Yacnier Luis | CUB | 49.96s | 6 | | 5. Christian Duma | GER | 50.04s | 3 | | 6. Ibrahim Maiga |  MLI | 50.62s | 5 | | 7. Kurt Couto |  MOZ | 52.04s | 4 |
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| Heat 2 13:58h | time | L | | 1. Kemel Thompson | JAM | 49.33s | 5 | | 2. Naman Keita | FRA | 49.58s | 4 | | 3. Gianni Carabelli | ITA | 49.87s | 6 | | 4. Kenji Narisako | JPN | 49.87s | 7 | | 5. Ari-Pekka Lattu | FIN | 50.23s | 2 | | 6. Mikael Jakobsson |  SWE | 50.35s | 3 |
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| Heat 3 14:06h | time | L | | 1. Bershawn Jackson | USA | 49.34s | 4 | | 2. Felix Sanchez | DOM | 49.47s | 2 | | 3. Yevgeniy Meleshenko | KAZ | 49.67s | 5 | | 4. Llewellyn Herbert | RSA | 49.98s | 3 | | 5. Sergio Hierrezuelo | CUB | 50.13s | 8 | | 6. Eduardo Ivan Rodriguez | ESP | 50.22s | 7 | | 7. Aleksey Pogorelov |  KGZ | 53.44s | 6 |
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| Heat 4 14:14h | time | L | | 1. Periklis Iakovakis | GRE | 49.22s | 6 | | 2. L.J. van Zyl | RSA | 49.35s | 4 | | 3. Rhys Williams | GBR | 49.73s | 2 | | 4. Dean Griffiths | JAM | 49.79s | 7 | | 5. O'Neil Wright |  LBR | 50.90s | 3 | | 6. Jiri Muzik |  CZE | 52.21s | 5 |
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| Heat 5 14:22h | time | L | | 1. James Carter | USA | 49.05s | 2 | | 2. Dai Tamesue | JPN | 49.17s | 3 | | 3. Bayano Kamani | PAN | 49.18s | 6 | | 4. Hadi Souaan Al-Somaily | KSA | 49.70s | 7 | | 5. Akos Dezso |  HUN | 51.36s | 5 | | 6. Toetuu Sapoi Aleki |  TGA | 56.06s | 4 | | -. Edivaldo Monteiro |  POR | DNF | 8 |
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| Athlete | Team | H | L | 2005 | Best | | Kerron Clement | USA | 1 | 2 | 47.24s | 47.24s | | Bershawn Jackson | USA | 3 | 4 | 47.62s | 47.62s | | James Carter | USA | 5 | 2 | 47.95s | 47.57s | | Kemel Thompson | JAM | 2 | 5 | 48.14s | 48.05s | | L.J. van Zyl | RSA | 4 | 4 | 48.16s | 48.16s | | Periklis Iakovakis | GRE | 4 | 6 | 48.24s | 48.17s | | Naman Keita | FRA | 2 | 4 | 48.27s | 48.17s | | Bayano Kamani | PAN | 5 | 6 | 48.36s | 48.23s | | Felix Sanchez | DOM | 3 | 2 | 48.40s | 47.25s | | Pieter de Villiers | RSA | 1 | 7 | 48.46s | 48.46s | | Danny Mcfarlane | JAM | 1 | 8 | 48.53s | 48.00s | | Llewellyn Herbert | RSA | 3 | 3 | 48.57s | 47.81s | | Dai Tamesue | JPN | 5 | 3 | 48.66s | 47.89s | | Kenji Narisako | JPN | 2 | 7 | 48.71s | 48.54s | | Dean Griffiths | JAM | 4 | 7 | 48.78s | 48.55s | | Jiri Muzik | CZE | 4 | 5 | 48.83s | 48.27s | | Gianni Carabelli | ITA | 2 | 6 | 48.84s | 48.84s | | Hadi Souaan Al-Somaily | KSA | 5 | 7 | 49.02s | 47.53s | | Sergio Hierrezuelo | CUB | 3 | 8 | 49.11s | 49.11s |
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| Athlete | Team | H | L | 2005 | Best | | Yevgeniy Meleshenko | KAZ | 3 | 5 | 49.21s | 48.46s | | Edivaldo Monteiro | POR | 5 | 8 | 49.26s | 49.10s | | Mikael Jakobsson | SWE | 2 | 3 | 49.47s | 49.38s | | O'Neil Wright | LBR | 4 | 3 | 49.55s | 49.55s | | Rhys Williams | GBR | 4 | 2 | 49.60s | 49.60s | | Ari-Pekka Lattu | FIN | 2 | 2 | 49.67s | 49.36s | | Akos Dezso | HUN | 5 | 5 | 49.67s | 49.67s | | Yacnier Luis | CUB | 1 | 6 | 49.12s | 48.83s | | Christian Duma | GER | 1 | 3 | 49.17s | 49.17s | | Eduardo Ivan Rodriguez | ESP | 3 | 7 | 50.18s | 49.08s |
| Athlete | Team | H | L | 2005 | Best | | Ibrahim Maiga | MLI | 1 | 5 | 50.18s | 50.18s | | Kurt Couto | MOZ | 1 | 4 | 50.83s | 50.83s | | Aleksey Pogorelov | KGZ | 3 | 6 | 51.86s | 51.30s | | Aleki Toetuu Sapoi | TGA | 5 | 4 | 55.40s | 53.57s |
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