| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Ian Morris |  TTO | 47.03 | |
| 2 | Cayetano Cornet |  ESP | 47.11 | |
| 3 | Paul Greene |  AUS | 47.67 | |
| 4 | Christopher Nibilo |  TAN | 48.40 NR | |
| 5 | Benyounés Lahlou |  MAR | 48.94 | |
| Ali Faudet |  CHA | DNS | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Samson Kitur |  KEN | 47.04 | |
| 2 | Howard Burnett |  JAM | 47.11 | |
| 3 | Raymond Pierre |  USA | 47.18 | |
| 4 | Christian Boda |  MRI | 49.47 | |
| 5 | Julio Caballero |  PAR | 50.95 NR | |
| Dmitriy Golovastov |  URS | DNF | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Charles Jenkins |  USA | 47.17 | |
| 2 | Devon Morris |  JAM | 47.28 | |
| 3 | Amar Hecini |  ALG | 47.95 | |
| 4 | Inaldo Justino Sena |  BRA | 49.49 | |
| Desi Wynter |  ISV | DQ | ||
| Morris Okinda |  TAN | DNS | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Alvin Daniel |  TTO | 47.19 | |
| 2 | Antonio Sánchez |  ESP | 47.33 | |
| 3 | Mark Garner |  AUS | 47.52 | |
| 4 | Abdelali Kasbane |  MAR | 47.56 NR | |
| 5 | Roberto Bortolotto |  BRA | 49.07 | |
| Ahmed Abdelhalim Ghanem |  EGY | DNS |