| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 601 | Fabrizio Mori |  ITA | 49.29 Q | 0.159 | 
| 2 | 625 | Ian Weakley |  JAM | 49.40 Q | 0.172 | 
| 3 | 968 | Boris Gorban |  RUS | 49.60 Q | 0.167 | 
| 4 | 916 | Edivaldo Monteiro |  POR | 50.42 | 0.150 | 
| 5 | 648 | Hideaki Kawamura |  JPN | 50.61 | 0.152 | 
| 6 | 1028 | Harijan Ratnayake |  SRI | 51.28 | 0.237 | 
| 443 | Du'aine Ladejo |  GBR | DNS | 0.000 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 277 | Felix Sánchez |  DOM | 48.64 Q | 0.162 | 
| 2 | 771 | Mustapha Sdad |  MAR | 48.96 Q NR | 0.190 | 
| 3 | 887 | Pawel Januszewski |  POL | 49.33 Q | 0.153 | 
| 4 | 319 | Eduardo Iván RodrÃguez |  ESP | 49.51 q | 0.169 | 
| 5 | 1156 | Calvin Davis |  USA | 49.93 q | 0.124 | 
| 6 | 47 | Blair Young |  AUS | 50.17 q | 0.176 | 
| 7 | 1075 | Hani Mourhej |  SYR | 50.69 | 0.174 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 645 | Dai Tamesue |  JPN | 49.45 Q | 0.192 | 
| 2 | 134 | Eronilde Nunes de Araújo |  BRA | 50.16 Q | 0.152 | 
| 3 | 1147 | James Carter |  USA | 50.41 Q | 0.154 | 
| 4 | 1041 | Alain Rohr |  SUI | 50.50 | 0.162 | 
| 5 | 944 | Marnus Kritzinger |  RSA | 51.20 | 0.170 | 
| 6 | 882 | Mowen Boino |  PNG | 51.82 | 0.185 | 
| 1096 | Tien-Wen Chen |  TPE | DQ | 0.140 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 612 | Neil Gardner |  JAM | 49.29 Q | 0.142 | 
| 2 | 1203 | Angelo Taylor |  USA | 49.39 Q | 0.196 | 
| 3 | 980 | Ruslan Mashchenko |  RUS | 49.50 Q | 0.171 | 
| 4 | 413 | Anthony Borsumato |  GBR | 49.65 q | 0.144 | 
| 5 | 1004 | Ibou Faye |  SEN | 50.26 | 0.262 | 
| 6 | 180 | Monte Raymond |  CAN | 50.71 | 0.148 | 
| 1119 | Hennadiy Horbenko |  UKR | DNF | 0.176 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 442 | Christopher Rawlinson |  GBR | 49.38 Q | 0.142 | 
| 2 | 898 | Marek Plawgo |  POL | 49.75 Q | 0.155 | 
| 3 | 623 | Mario Watts |  JAM | 49.86 Q | 0.147 | 
| 4 | 949 | Alwyn Myburgh |  RSA | 49.96 q | 0.152 | 
| 5 | 252 | Stepan Tesarik |  CZE | 50.30 | 0.142 | 
| 6 | 646 | Ken Yoshizawa |  JPN | 50.32 | 0.160 | 
| 7 | 1248 | Ian Harnden |  ZIM | 51.67 | 0.195 | 
| POS | BIB | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|---|
| 1 | 703 | Hadi Soua'an Al-Somaily |  KSA | 49.42 Q | 0.245 | 
| 2 | 253 | Jirà MužÃk |  CZE | 49.65 Q | 0.199 | 
| 3 | 501 | PeriklÃs Iakovákis |  GRE | 49.86 Q | 0.176 | 
| 4 | 752 | Yvon Rakotoarimiandry |  MAD | 50.08 q | 0.177 | 
| 5 | 943 | Llewellyn Herbert |  RSA | 50.28 | 0.149 | 
| 6 | 289 | Roberto Cortés |  ESA | 53.61 | 0.236 | 
| 720 | Viktors Lacis |  LAT | DNF | 0.207 |