| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 516 | Jamie Baulch |  GBR | 45.14 Q | 0.154 | 
| 2 | 1160 | Piotr Rysiukiewicz |  POL | 45.54 Q PB | 0.179 | 
| 3 | 156 | Anderson Jorge dos Santos |  BRA | 45.61 Q | 0.150 | 
| 4 | 834 | Jun Osakada |  JPN | 45.71 | 0.161 | 
| 5 | 815 | Michael McDonald |  JAM | 45.87 | 0.245 | 
| 6 | 1076 | Udeme Ekpeyong |  NGR | 46.40 | 0.330 | 
| 7 | 1227 | Jopie van Oudtshoorn |  RSA | 46.42 | 0.148 | 
| 1498 | Antonio Pettigrew |  USA | DQ | 0.291 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 1481 | Michael Johnson |  USA | 45.10 Q | 0.152 | 
| 2 | 1141 | Tomasz Czubak |  POL | 45.27 Q | 0.188 | 
| 3 | 1281 | Ibrahima Wade |  SEN | 45.53 Q | 0.288 | 
| 4 | 814 | Danny McFarlane |  JAM | 45.54 Q | 0.312 | 
| 5 | 1074 | Sunday Bada |  NGR | 45.69 | 0.243 | 
| 6 | 358 | David Canal |  ESP | 46.21 | 0.183 | 
| 7 | 1316 | Sugath Thilakaratne |  SRI | 46.40 | 0.260 | 
| 8 | 204 | Shane Niemi |  CAN | 46.57 | 0.238 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 993 | Alejandro Manuel Cárdenas |  MEX | 44.97 Q | 0.137 | 
| 2 | 533 | Mark Richardson |  GBR | 44.98 Q | 0.180 | 
| 3 | 862 | Kennedy Ochieng |  KEN | 45.13 Q | 0.195 | 
| 4 | 1149 | Robert Mackowiak |  POL | 45.23 SB | 0.161 | 
| 5 | 1215 | Arnaud Malherbe |  RSA | 45.77 | 0.248 | 
| 6 | 465 | Marc Foucan |  FRA | 45.78 | 0.191 | 
| 1513 | Jerome Young |  USA | DQ | 0.180 | |
| 1033 | Eric Milazar |  MRI | DNS | 0.000 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 153 | Sanderlei Parrela |  BRA | 44.72 Q | 0.161 | 
| 2 | 808 | Gregory Haughton |  JAM | 45.13 Q | 0.224 | 
| 3 | 1454 | Jerome Davis |  USA | 45.14 Q | 0.142 | 
| 4 | 1293 | Matija Å estak |  SLO | 45.43 Q NR | 0.138 | 
| 5 | 1075 | Clement Chukwu |  NGR | 45.50 | 0.142 | 
| 6 | 1187 | Ibrahim Ismail Muftah |  QAT | 46.04 | 0.226 | 
| 7 | 1558 | Philip Mukomana |  ZIM | 46.36 | 0.163 | 
| 8 | 832 | Masayoshi Kan |  JPN | 46.37 | 0.162 |