| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 168 | Yasser Lismet |  CUB | 51.27 Q | 0.147 | 
| 2 | 696 | L.J. van Zyl |  RSA | 51.30 Q | 0.178 | 
| 3 | 65 | Michaël Bultheel |  BEL | 51.46 Q PB | 0.161 | 
| 4 | 407 | Nicola Cascella |  ITA | 51.47 q PB | 0.152 | 
| 5 | 428 | Markino Buckley |  JAM | 52.03 q PB | 0.166 | 
| 6 | 726 | Aleksandr Tishkin |  RUS | 52.15 | 0.176 | 
| 7 | 452 | Teppei Suzuki |  JPN | 52.24 SB | 0.227 | 
| 8 | 810 | Cheng-Kang Chung |  TPE | 53.66 | 0.165 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 496 | Ibrahim Al-Hamaidi |  KSA | 50.02 Q | 0.185 | 
| 2 | 686 | Wouter le Roux |  RSA | 51.12 Q | 0.155 | 
| 3 | 236 | Teemu Linkosaari |  FIN | 51.56 Q PB | 0.167 | 
| 4 | 453 | Go Tanabe |  JPN | 52.01 q SB | 0.170 | 
| 5 | 279 | Ryan Dinham |  GBR | 52.86 | 0.145 | 
| 6 | 369 | Balázs Molnár |  HUN | 52.97 | 0.126 | 
| 7 | 437 | Josef Robertson |  JAM | 53.05 | 0.160 | 
| 8 | 245 | Fadil Bellaabouss |  FRA | 53.48 | 0.174 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 868 | Kerron Clement |  USA | 50.10 Q | 0.144 | 
| 2 | 278 | Richard Davenport |  GBR | 51.08 Q PB | 0.155 | 
| 3 | 742 | El Hadji Sethe Mbow |  SEN | 51.48 Q | 0.209 | 
| 4 | 508 | Bandar Yahya Shraheli |  KSA | 51.63 q PB | 0.154 | 
| 5 | 261 | Florent Joulain |  FRA | 52.74 | 0.163 | 
| 6 | 830 | Tuncay Örs |  TUR | 54.27 | 0.169 | 
| 7 | 814 | Hao-Yi Wang |  TPE | 55.26 | 0.158 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 884 | Brandon Johnson |  USA | 50.11 Q | 0.152 | 
| 2 | 919 | VÃctor Solarte |  VEN | 51.96 Q | 0.149 | 
| 3 | 93 | Diego Venâncio |  BRA | 52.02 Q | 0.216 | 
| 4 | 646 | Ricardo Lima |  POR | 52.47 SB | 0.176 | 
| 5 | 648 | Manuel Garcia |  PUR | 52.82 | 0.171 | 
| 6 | 401 | Yuriy Pelles |  ISR | 53.09 | 0.201 | 
| 7 | 160 | Milan Kotur |  CRO | 53.28 | 0.173 | 
| 743 | Seleke Samake |  SEN | DNS | 0.000 |