| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Felix Sánchez |  DOM | 47.93 Q | 0.224 | 
| 2 | Marek Plawgo |  POL | 48.16 Q NR | 0.246 | 
| 3 | Alwyn Myburgh |  RSA | 48.21 q SB | 0.242 | 
| 4 | Angelo Taylor |  USA | 48.72 | 0.217 | 
| 5 | Hadi Soua'an Al-Somaily |  KSA | 48.98 SB | 0.261 | 
| 6 | Mikhail Lipskiy |  RUS | 49.10 | 0.229 | 
| 7 | Edivaldo Monteiro |  POR | 49.26 | 0.162 | 
| 8 | Dean Griffiths |  JAM | 49.51 | 0.260 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Danny McFarlane |  JAM | 48.00 Q PB | 0.243 | 
| 2 | Bennie Brazell |  USA | 48.19 Q | 0.309 | 
| 3 | Dai Tamesue |  JPN | 48.46 SB | 0.273 | 
| 4 | PeriklÃs Iakovákis |  GRE | 48.47 SB | 0.242 | 
| 5 | Llewellyn Herbert |  RSA | 48.57 | 0.230 | 
| 6 | Eduardo Iván RodrÃguez |  ESP | 49.77 | 0.223 | 
| 7 | Stepan Tesarik |  CZE | 49.87 | 0.205 | 
| 8 | Christopher Rawlinson |  GBR | 50.89 | 0.176 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | James Carter |  USA | 48.18 Q | 0.214 | 
| 2 | Bayano Kamani |  PAN | 48.23 Q NR | 0.225 | 
| 3 | Naman Keïta |  FRA | 48.24 q | 0.356 | 
| 4 | Kemel Thompson |  JAM | 48.25 SB | 0.257 | 
| 5 | Jirà MužÃk |  CZE | 48.88 | 0.313 | 
| 6 | Ockert Cilliers |  RSA | 49.01 | 0.175 | 
| 7 | Boris Gorban |  RUS | 49.46 | 0.243 | 
| 8 | Yevgeniy Meleshenko |  KAZ | 49.48 | 0.196 |