| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 601 | Fabrizio Mori |  ITA | 48.49 Q | 0.168 | 
| 2 | 703 | Hadi Soua'an Al-Somaily |  KSA | 48.64 Q | 0.145 | 
| 3 | 625 | Ian Weakley |  JAM | 49.04 | 0.168 | 
| 4 | 1203 | Angelo Taylor |  USA | 49.23 | 0.179 | 
| 5 | 980 | Ruslan Mashchenko |  RUS | 49.32 | 0.169 | 
| 6 | 413 | Anthony Borsumato |  GBR | 49.48 | 0.139 | 
| 7 | 752 | Yvon Rakotoarimiandry |  MAD | 49.81 | 0.157 | 
| 8 | 319 | Eduardo Iván RodrÃguez |  ESP | 49.92 | 0.134 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 442 | Christopher Rawlinson |  GBR | 48.27 Q SB | 0.145 | 
| 2 | 968 | Boris Gorban |  RUS | 48.50 Q PB | 0.168 | 
| 3 | 253 | Jirà MužÃk |  CZE | 48.53 q SB | 0.171 | 
| 4 | 1156 | Calvin Davis |  USA | 48.99 | 0.148 | 
| 5 | 501 | PeriklÃs Iakovákis |  GRE | 49.38 | 0.200 | 
| 6 | 612 | Neil Gardner |  JAM | 49.57 | 0.140 | 
| 7 | 898 | Marek Plawgo |  POL | 49.80 | 0.140 | 
| 8 | 949 | Alwyn Myburgh |  RSA | 50.34 | 0.154 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 277 | Felix Sánchez |  DOM | 48.07 Q | 0.144 | 
| 2 | 645 | Dai Tamesue |  JPN | 48.10 Q NR | 0.187 | 
| 3 | 887 | Pawel Januszewski |  POL | 48.40 q SB | 0.147 | 
| 4 | 771 | Mustapha Sdad |  MAR | 49.14 | 0.202 | 
| 5 | 1147 | James Carter |  USA | 49.38 | 0.137 | 
| 6 | 623 | Mario Watts |  JAM | 49.96 | 0.164 | 
| 7 | 47 | Blair Young |  AUS | 50.21 | 0.183 | 
| 8 | 134 | Eronilde Nunes de Araújo |  BRA | 51.23 | 0.159 |