| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Jamie Baulch |  GBR | 45.85 Q | |
| 2 | Roxbert Martin |  JAM | 46.04 Q | |
| 3 | Tawanda Chiwira |  ZIM | 46.09 Q | |
| 4 | Benjamin Youla |  CGO | 46.62 Q NR | |
| 5 | Roman Galkin |  UKR | 46.82 | |
| 6 | Antonio Andrés |  ESP | 46.94 | |
| Neil de Silva |  TTO | DNF | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Michael McDonald |  JAM | 45.89 Q | |
| 2 | Davis Kamoga |  UGA | 46.17 Q | |
| 3 | Alejandro Manuel Cárdenas |  MEX | 46.26 Q | |
| 4 | Ju-il Shon |  KOR | 47.47 Q | |
| 5 | Liod Kgopong |  RSA | 47.66 | |
| 6 | Kendon Maynard |  ISV | 47.83 | |
| 7 | Mohsin Munir |  PAK | 49.61 | |
| Jude Monye |  NGR | DNS | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Sanderlei Parrela |  BRA | 45.35 Q | |
| 2 | Tyree Washington |  USA | 45.35 Q | |
| 3 | Sugath Thilakaratne |  SRI | 45.58 Q NR | |
| 4 | Ibrahima Wade |  SEN | 45.61 Q | |
| 5 | Mathias Rusterholz |  SUI | 45.76 SB | |
| 6 | Jean-Louis Rapnouil |  FRA | 45.85 | |
| 7 | Kenmore Hughes |  ANT | 47.11 SB | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Iwan Thomas |  GBR | 45.62 Q | |
| 2 | Davian Clarke |  JAM | 45.77 Q | |
| 3 | Tomasz Czubak |  POL | 45.82 Q | |
| 4 | Arnaud Malherbe |  RSA | 46.08 Q | |
| 5 | Samir-Adel Louahla |  ALG | 46.22 | |
| 6 | Konstantinos Moumoulidis |  GRE | 46.64 | |
| 7 | Evripides Demosthenous |  CYP | 47.57 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Michael Johnson |  USA | 45.66 Q | |
| 2 | Eswort Coombs |  VIN | 45.78 Q | |
| 3 | Hachim Ndiaye |  SEN | 45.84 Q | |
| 4 | Kennedy Ochieng |  KEN | 45.88 Q | |
| 5 | Marco Vaccari |  ITA | 46.00 | |
| 6 | Odair Pericles da Costa |  STP | 46.48 PB | |
| 7 | Jan Poděbradský |  CZE | 46.52 SB | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Jerome Young |  USA | 45.34 Q | |
| 2 | Mark Richardson |  GBR | 45.44 Q | |
| 3 | Sunday Bada |  NGR | 45.79 Q | |
| 4 | Ibrahim Ismail Muftah |  QAT | 45.88 Q | |
| 5 | Soloveni Koroi |  FIJ | 46.51 | |
| 6 | Shigekazu Omori |  JPN | 47.09 | |
| 7 | Eugene Farrell |  IRL | 48.20 SB | |
| 8 | Bashir Mohamed Al Khewani |  YEM | 50.96 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Štefan Balošák |  SVK | 45.84 Q | |
| 2 | Clement Chukwu |  NGR | 46.10 Q | |
| 3 | Robert Mackowiak |  POL | 46.15 Q | |
| 4 | Rafik Elouardi |  AUT | 46.95 | |
| 5 | Dennis Darling |  BAH | 47.96 | |
| 6 | Angelo Ignatius |  AHO | 49.01 | |
| Antonio Pettigrew |  USA | DQ |