Event Date: 25/07/2009 Start Time: 15:00 Event No: 11
| Name | PB | SB | Status |
|---|---|---|---|
| Kerron Clement (USA) | 47.24 | 48.09 | Confirmed |
| David Greene (GBR) | 48.27 | 48.62 | Confirmed |
| Bershawn Jackson (USA) | 47.30 | 48.03 | Confirmed |
| Reuben McCoy (USA) | 48.37 | 49.78 | Confirmed |
| Felix Sanchez (DOM) | 47.25 | 48.78 | Confirmed |
| Michael Tinsley (USA) | 48.02 | 48.53 | Confirmed |
| L J van Zyl (RSA) | 48.05 | 48.18 | Confirmed |
| Rhys Williams (GBR) | 49.09 | 49.38 | Confirmed |
