| POS | Rank | Heat | ATHLETE | COUNTRY | RESULTS |
|---|---|---|---|---|---|
| 1 | 1 | 1 | Michael NORMAN |
USA |
44.40 |
| 2 | 2 | 1 | Michael CHERRY |
USA |
44.86 |
| 3 | 3 | 1 | Deon LENDORE |
TTO |
45.04 |
| 4 | 4 | 1 | Emmanuel Kipkurui KORIR |
KEN |
45.29 |
| 5 | 5 | 1 | Wilbert LONDON |
USA |
45.31 |
| 6 | 6 | 1 | Justin ROBINSON |
USA |
45.38 |
| 7 | 1 | 2 | Machel CEDENIO |
TTO |
45.47 |
| 8 | 7 | 1 | Matthew HUDSON-SMITH |
GBR |
46.03 |
| 9 | 2 | 2 | Marcus CHAMBERS |
USA |
46.39 |
| 10 | 3 | 2 | Myles PRINGLE |
USA |
46.40 |
| 11 | 4 | 2 | Tony MCQUAY |
USA |
46.78 |
| 12 | 8 | 1 | Chidi OKEZIE |
NGR |
47.02 |