| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Osiris MartÃnez |  CUB | 50.45 Q PB | 0.022 | 
| 2 | Chin-Fu Lin |  TPE | 50.47 Q NR | 0.017 | 
| 3 | Terrance Wilson |  USA | 51.10 Q | 0.017 | 
| 4 | Francois Coetzee |  RSA | 51.35 q | 0.012 | 
| 5 | Tomasz Rudnik |  POL | 51.47 q PB | 0.023 | 
| 6 | Tahar Ghozali |  ALG | 52.12 NR | 0.020 | 
| 7 | Richard McDonald |  GBR | 52.13 PB | 0.018 | 
| 8 | David Lloyd |  JAM | 52.15 | 0.014 | 
| POS | ATHLETE | COUNTRY | MARK | Reaction Time | 
|---|---|---|---|---|
| 1 | Peter Bate |  AUS | 50.50 Q PB | 0.023 | 
| 2 | PeriklÃs Iakovákis |  GRE | 50.73 Q | 0.026 | 
| 3 | Chabib El Azouizi |  MAR | 51.11 Q NR | 0.019 | 
| 4 | Satoshi Oshikawa |  JPN | 51.55 PB | 0.021 | 
| 5 | Reginald DePass |  USA | 51.89 | 0.025 | 
| 6 | Carlos Garcia |  ESP | 52.03 | 0.024 | 
| 7 | Nicholas O'Brien |  NZL | 52.04 PB | 0.023 | 
| 8 | Stefano Cuzzi |  ITA | 52.71 | 0.026 |