| POS | Rank | Heat | BIB | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|---|
| 1 | 1 | 2 | 133 | Tyler Christopher |
CAN |
45.47 Q |
| 2 | 1 | 1 | 503 | Brandon Simpson |
JAM |
45.53 Q |
| 3 | 1 | 3 | 1039 | Jeremy Wariner |
USA |
45.65 Q |
| 4 | 2 | 2 | 1042 | Darold Williamson |
USA |
45.65 Q |
| 5 | 3 | 2 | 341 | Timothy Benjamin |
GBR |
45.66 q |
| 6 | 2 | 3 | 49 | Chris Brown |
BAH |
45.67 Q |
| 7 | 2 | 1 | 1023 | Andrew Rock |
USA |
45.78 Q |
| 8 | 3 | 1 | 34 | John Steffensen |
AUS |
46.06 q |
| 9 | 4 | 1 | 206 | Carlos Santa |
DOM |
46.07 |
| 10 | 4 | 2 | 203 | Arismendy Peguero |
DOM |
46.08 |
| 11 | 5 | 2 | 161 | Gary Kikaya |
COD |
46.15 |
| 12 | 3 | 3 | 492 | Michael Blackwood |
JAM |
46.25 |
| 13 | 5 | 1 | 420 | Alleyne Francique |
GRN |
46.59 |
| 14 | 6 | 1 | 680 | James Godday |
NGR |
46.62 |
| 15 | 6 | 2 | 861 | Nagmeldin Ali Abubakr |
SUD |
46.67 |
| 16 | 4 | 3 | 356 | Robert Tobin |
GBR |
46.69 |
| 17 | 7 | 1 | 584 | Hamdan Odha Al-Bishi |
KSA |
46.80 |
| 18 | 8 | 1 | 455 | Andrea Barberi |
ITA |
47.10 |
| 19 | 5 | 3 | 869 | Pierre Lavanchy |
SUI |
47.19 |
| 20 | 7 | 2 | 504 | Lansford Spence |
JAM |
47.20 |
| 21 | 6 | 3 | 1055 | Young Talkmore Nyongani |
ZIM |
47.20 |
| 22 | 7 | 3 | 87 | California Molefe |
BOT |
47.26 |
| 23 | 8 | 3 | 530 | Mitsuhiro Sato |
JPN |
48.55 |
| 2 | 928 | Sofiane Labidi |
TUN |
DNF |