| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 604 | PeriklÃs Iakovákis |  GRE | 48.76 Q | 0.170 | 
| 2 | 1435 | Eric Thomas |  USA | 48.87 Q | 0.153 | 
| 3 | 462 | Stéphane Diagana |  FRA | 49.00 Q | 0.186 | 
| 4 | 781 | Dai Tamesue |  JPN | 49.45 q | 0.234 | 
| 5 | 446 | Ari-Pekka Lattu |  FIN | 50.19 | 0.364 | 
| 6 | 209 | Adam Kunkel |  CAN | 50.68 | 0.209 | 
| 7 | 122 | Michael Aguilar |  BIZ | 51.33 NR | 0.201 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1447 | Joey Woody |  USA | 48.53 Q | 0.184 | 
| 2 | 527 | Christopher Rawlinson |  GBR | 48.73 Q | 0.191 | 
| 3 | 1117 | Mubarak Faraj Al-Nubi |  QAT | 48.90 Q SB | 0.147 | 
| 4 | 1169 | Boris Gorban |  RUS | 49.07 q | 0.172 | 
| 5 | 476 | Naman Keïta |  FRA | 49.08 q | 0.232 | 
| 6 | 405 | Eduardo Iván RodrÃguez |  ESP | 49.37 q SB | 0.167 | 
| 7 | 1103 | Edivaldo Monteiro |  POR | 50.31 | 0.142 | 
| 8 | 1327 | Tien-Wen Chen |  TPE | 51.42 SB | 0.199 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 744 | Kemel Thompson |  JAM | 48.63 Q | 0.189 | 
| 2 | 333 | Jirà MužÃk |  CZE | 48.88 Q | 0.188 | 
| 3 | 1147 | Alwyn Myburgh |  RSA | 48.92 Q | 0.167 | 
| 4 | 847 | Hadi Soua'an Al-Somaily |  KSA | 48.97 q SB | 0.178 | 
| 5 | 510 | Anthony Borsumato |  GBR | 49.16 q | 0.177 | 
| 6 | 1282 | Mikael Jakobsson |  SWE | 49.40 q SB | 0.152 | 
| 7 | 308 | Yacnier Luis |  CUB | 49.73 | 0.209 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 360 | Felix Sánchez |  DOM | 48.43 Q | 0.159 | 
| 2 | 730 | Dean Griffiths |  JAM | 48.75 Q | 0.185 | 
| 3 | 1138 | Ockert Cilliers |  RSA | 49.17 Q | 0.160 | 
| 4 | 486 | Sébastien Maillard |  FRA | 49.25 q | 0.191 | 
| 5 | 1266 | Cédric El-Idrissi |  SUI | 50.04 | 0.156 | 
| 6 | 784 | Ken Yoshizawa |  JPN | 50.34 | 0.204 | 
| 7 | 1060 | Bayano Kamani |  PAN | 51.18 | 0.147 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1142 | Llewellyn Herbert |  RSA | 48.55 Q | 0.130 | 
| 2 | 741 | Danny McFarlane |  JAM | 48.86 Q | 0.171 | 
| 3 | 792 | Yevgeniy Meleshenko |  KAZ | 48.95 Q SB | 0.179 | 
| 4 | 337 | Stepan Tesarik |  CZE | 49.09 q PB | 0.172 | 
| 5 | 1019 | Victor Okorie |  NGR | 49.66 | 0.157 | 
| 951 | Ibrahim Maïga |  MLI | DQ | 0.157 | |
| 1405 | Bershawn Jackson |  USA | DQ | 0.178 |