| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 524 | Rondell Bartholomew |  GRN | 44.82 Q | 0.183 | 
| 2 | 1013 | Renny QUOW |  TTO | 44.84 Q SB | 0.168 | 
| 3 | 1106 | Greg Nixon |  USA | 45.16 Q | 0.193 | 
| 4 | 565 | Tabarie Henry |  ISV | 45.22 Q | 0.146 | 
| 5 | 596 | Riker Hylton |  JAM | 45.54 q | 0.212 | 
| 6 | 178 | Mathieu Gnanligo |  BEN | 47.01 | 0.202 | 
| 7 | 822 | Nelson Stone |  PNG | 47.86 | 0.202 | 
| 8 | 527 | Kerfalla Camara |  GUI | 49.74 PB | 0.192 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 594 | Jermaine Gonzales |  JAM | 45.12 Q | 0.177 | 
| 2 | 1131 | Jamaal Torrance |  USA | 45.44 Q | 0.161 | 
| 3 | 840 | Marcin Marciniszyn |  POL | 45.51 Q | 0.183 | 
| 4 | 160 | Demetrius Pinder |  BAH | 45.53 Q | 0.154 | 
| 5 | 303 | Erison Hurtault |  DMA | 46.10 q | 0.168 | 
| 6 | 110 | Nicolau Palanca |  ANG | 49.37 SB | 0.300 | 
| 7 | 211 | Ak. Hafiy Tajuddin Rositi |  BRU | 50.12 | 0.173 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1099 | LaShawn Merritt |  USA | 44.35 Q WL | 0.267 | 
| 2 | 171 | Kévin BORLÉE |  BEL | 44.77 Q | 0.177 | 
| 3 | 963 | Rabah YOUSIF |  SUD | 45.20 Q | 0.149 | 
| 4 | 618 | Yuzo Kanemaru |  JPN | 45.51 Q | 0.154 | 
| 5 | 934 | Pavel Trenikhin |  RUS | 45.55 q PB | 0.190 | 
| 6 | 1140 | Arnold Sorina |  VAN | 48.76 SB | 0.247 | 
| 260 | Gary Kikaya |  COD | DNS | ||
| 305 | Arismendy Peguero |  DOM | DNS | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 525 | Kirani JAMES |  GRN | 45.12 Q | 0.164 | 
| 2 | 170 | Jonathan BORLÉE |  BEL | 45.16 Q | 0.168 | 
| 3 | 158 | Ramon Miller |  BAH | 45.31 Q SB | 0.156 | 
| 4 | 278 | Williams Collazo |  CUB | 45.89 Q | 0.183 | 
| 5 | 696 | Taegeon Park |  KOR | 46.42 SB | 0.162 | 
| 6 | 190 | Pako Seribe |  BOT | 46.97 | 0.196 | 
| 7 | 815 | Augusto Stanley |  PAR | 47.31 | 0.179 | 
| 8 | 820 | Bahaa Al Farra |  PLE | 49.04 PB | 0.232 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 154 | Chris Brown |  BAH | 45.29 Q | 0.166 | 
| 2 | 456 | Martyn ROONEY |  GBR | 45.30 Q SB | 0.178 | 
| 3 | 896 | Oscar Pistorius |  RSA | 45.39 Q | 0.212 | 
| 4 | 874 | Femi OGUNODE |  QAT | 45.42 Q SB | 0.196 | 
| 5 | 271 | Nery Brenes |  CRC | 45.47 q | 0.183 | 
| 6 | 1097 | Tony MCQUAY |  USA | 46.76 | 0.175 | 
| 7 | 811 | Ahmed Mohamed Al-Merjabi |  OMA | 47.99 | 0.174 | 
| 794 | Abdou Razack Rabo Samma |  NIG | DQ | 0.214 |