| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 224 | Davian Clarke |  JAM | 46.34 Q | 0.227 | 
| 2 | 65 | Gary Kikaya |  COD | 46.46 Q SB | 0.147 | 
| 3 | 422 | Joe Mendel |  USA | 46.56 Q | 0.162 | 
| 4 | 94 | David Canal |  ESP | 46.70 | 0.195 | 
| 5 | 209 | David McCarthy |  IRL | 47.34 | 0.169 | 
| 6 | 10 | Casey Vincent |  AUS | 47.68 | 0.158 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 188 | Alleyne Francique |  GRN | 46.32 Q | 0.164 | 
| 2 | 394 | Sofiane Labidi |  TUN | 46.61 Q | 0.158 | 
| 3 | 409 | Milton Campbell |  USA | 46.67 Q | 0.220 | 
| 4 | 16 | Chris Brown |  BAH | 46.68 | 0.155 | 
| 5 | 225 | Gregory Haughton |  JAM | 46.81 | 0.246 | 
| 6 | 195 | Zsolt Szeglet |  HUN | 47.16 | 0.194 |