| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 74 | Wilan Louis |  BAR | 46.46 Q | 0.172 | 
| 2 | 584 | Abdellatif El Ghazaoui |  MAR | 46.68 Q NJ | 0.159 | 
| 3 | 102 | LuÃs Ambrosio |  BRA | 46.79 Q PB | 0.152 | 
| 4 | 874 | Luis Luna |  VEN | 46.96 Q | 0.170 | 
| 5 | 500 | Yuki Yamaguchi |  JPN | 47.74 | 0.160 | 
| 6 | 305 | Yohann Negre |  FRA | 48.19 | 0.155 | 
| 7 | 174 | Didier Assoumou |  CIV | 49.01 | 0.147 | 
| 8 | 136 | Nathan Vadeboncoeur |  CAN | 49.32 | 0.167 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 860 | Darold Williamson |  USA | 46.72 Q | 0.183 | 
| 2 | 351 | Kamghe Gaba |  GER | 46.98 Q PB | 0.180 | 
| 3 | 434 | David McCarthy |  IRL | 47.07 Q | 0.168 | 
| 4 | 455 | Jacopo Marin |  ITA | 47.23 Q PB | 0.167 | 
| 5 | 551 | Mohammed Al-Mowallad |  KSA | 47.41 q PB | 0.191 | 
| 6 | 709 | Shaine Morrison |  RSA | 47.72 q | 0.149 | 
| 7 | 812 | Jamil James |  TTO | 48.62 | 0.185 | 
| 492 | Yosuke Inoue |  JPN | DQ | 0.162 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 464 | Jermaine Gonzales |  JAM | 46.86 Q | 0.180 | 
| 2 | 308 | Brice Panel |  FRA | 47.03 Q | 0.204 | 
| 3 | 698 | Florin Suciu |  ROU | 47.06 Q | 0.194 | 
| 4 | 390 | DimÃtrios Grávalos |  GRE | 47.62 Q | 0.164 | 
| 5 | 626 | Saul Welgopwa |  NGR | 47.86 | 0.197 | 
| 6 | 830 | Andrés Silva |  URU | 48.14 | 0.153 | 
| 7 | 260 | David Testa |  ESP | 48.97 | 0.157 | 
| 8 | 597 | Elio Gijon |  MEX | 49.55 | 0.206 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 839 | Jonathan Fortenberry |  USA | 47.16 Q | 0.157 | 
| 2 | 669 | Piotr Zrada |  POL | 47.47 Q | 0.186 | 
| 3 | 31 | Courtney McLeod |  AUS | 48.11 Q | 0.174 | 
| 4 | 137 | Ryan Therrien |  CAN | 48.22 Q | 0.187 | 
| 5 | 355 | Stefan Wittl |  GER | 48.42 | 0.172 | 
| 6 | 179 | John Valoyes |  COL | 48.46 | 0.171 | 
| 7 | 745 | Evans Marie |  SEY | 48.54 | 0.190 | 
| 336 | Robert Tobin |  GBR | DNF | 0.193 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 889 | Young Talkmore Nyongani |  ZIM | 46.92 Q | 0.162 | 
| 2 | 619 | Robert Lathouwers |  NED | 47.24 Q | 0.244 | 
| 3 | 108 | Diego Venâncio |  BRA | 47.31 Q | 0.167 | 
| 4 | 583 | Hicham Chliyeh |  MAR | 47.39 Q | 0.259 | 
| 5 | 32 | Keith Sheehy |  AUS | 47.42 q | 0.137 | 
| 6 | 466 | Yhann Plummer |  JAM | 47.47 q | 0.186 | 
| 7 | 878 | Saeed Al-Adhreai |  YEM | 49.97 NJ | 0.194 | 
| 635 | Timothy Hawkes |  NZL | DNF | 0.237 |