| POS | Rank | Heat | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|
| 1 | 1 | 1 | Jeremy Wariner |
USA |
45.13 |
| 2 | 2 | 1 | Jermaine Gonzales |
JAM |
45.16 |
| 3 | 3 | 1 | Rondell Bartholomew |
GRN |
45.17 |
| 4 | 1 | 2 | Michael Bingham |
GBR |
45.42 |
| 5 | 4 | 1 | Chris Brown |
BAH |
45.50 |
| 6 | 5 | 1 | Oscar Pistorius |
RSA |
45.69 |
| 7 | 6 | 1 | Kévin BORLÉE |
BEL |
45.86 |
| 8 | 2 | 2 | Erison Hurtault |
DMA |
46.30 |
| 9 | 7 | 1 | Renny QUOW |
TTO |
46.39 |
| 10 | 3 | 2 | Jamaal Torrance |
USA |
46.61 |
| 11 | 4 | 2 | David Gillick |
IRL |
46.64 |
| 12 | 8 | 1 | Ricardo Chambers |
JAM |
46.74 |
| 13 | 5 | 2 | Bereket Desta |
ETH |
47.46 |
| 14 | 6 | 2 | Reggie Witherspoon |
USA |
48.02 |
| 2 | Lionel Larry |
USA |
DNF |