| POS | Rank | Heat | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|
| 1 | 1 | 1 | Jeremy Wariner |
USA |
44.87 Q |
| 2 | 1 | 3 | Brandon Simpson |
JAM |
44.97 Q |
| 3 | 2 | 3 | Otis Harris |
USA |
44.99 Q |
| 4 | 2 | 1 | Michael Blackwood |
JAM |
45.00 Q |
| 5 | 3 | 1 | Leslie Djhone |
FRA |
45.01 q |
| 6 | 1 | 2 | Derrick Brew |
USA |
45.05 Q |
| 7 | 3 | 3 | Alleyne Francique |
GRN |
45.08 q |
| 8 | 4 | 1 | Eric Milazar |
MRI |
45.23 |
| 8 | 4 | 1 | Lewis Banda |
ZIM |
45.23 |
| 10 | 2 | 2 | Davian Clarke |
JAM |
45.27 Q |
| 11 | 3 | 2 | Chris Brown |
BAH |
45.31 |
| 12 | 4 | 2 | Yeimer López |
CUB |
45.52 |
| 13 | 4 | 3 | Carlos Santa |
DOM |
45.58 |
| 13 | 6 | 1 | Gary Kikaya |
COD |
45.58 |
| 15 | 5 | 3 | Hamdan Odha Al-Bishi |
KSA |
45.59 |
| 16 | 5 | 2 | Alejandro Manuel Cárdenas |
MEX |
45.64 |
| 17 | 6 | 3 | Saul Welgopwa |
NGR |
45.67 |
| 18 | 7 | 1 | Ezra Sambu |
KEN |
45.84 |
| 19 | 6 | 2 | K. Mathews Binu |
IND |
45.97 |
| 20 | 8 | 1 | Cedric van Branteghem |
BEL |
46.03 |
| 21 | 7 | 3 | Ingo Schultz |
GER |
46.23 |
| 22 | 8 | 3 | Timothy Benjamin |
GBR |
46.28 |
| 23 | 7 | 2 | Matija Å estak |
SLO |
46.54 |
| 2 | Anton Galkin |
RUS |
DQ |