| 1 | Timothy Benjamin | GBR | 44,85 | Q | |
| 2 | Brandon Simpson | JAM | 44,98 | Q | |
| 3 | James Godday | NGR | 45,30 | q | |
| 4 | California Molefe | BOT | 45,34 | q | NR |
| 5 | Pierre Lavanchy | SUI | 45,79 | q | |
| 6 | Zeljko Vincek | CRO | 46,03 | ||
| 7 | Abdesalem Khalifeh Bajes Al-Hajjaj | JOR | 48,89 | ||
| 8 | Florent Battistel | MON | 50,54 |
| 1 | Jeremy Wariner | USA | 45,24 | Q |
| 2 | Robert Tobin | GBR | 45,41 | Q |
| 3 | Talkmore Nyongani Young | ZIM | 45,55 | q |
| 4 | Hamdan Odha Al-Bishi | KSA | 45,88 | q |
| 5 | Cedric van Branteghem | BEL | 46,42 | |
| 6 | Alejandro Cárdenas | MEX | 46,73 | |
| 7 | Isaac Yaya | PYF | 47,75 |
| 1 | John Steffensen | AUS | 45,62 | Q |
| 2 | Tyler Christopher | CAN | 45,66 | Q |
| 3 | Arismendi Peguero | DOM | 45,80 | q |
| 4 | Eric Milazar | MRI | 45,91 | |
| 5 | Andrae Williams | BAH | 46,49 | |
| 6 | Simon Kirch | GER | 47,45 | |
| 7 | Saeed Al-Adhreai | YEM | 49,74 | |
| Islam Tawhid Tawhidul | BAN | DQ |
| 1 | Andrew Rock | USA | 44,98 | Q |
| 2 | Christopher Brown | BAH | 45,20 | Q |
| 3 | Andrea Barberi | ITA | 45,70 | q |
| 4 | Sofiane Labidi | TUN | 45,71 | q |
| 5 | Mitsuhiro Sato | JPN | 45,78 | q |
| 6 | Anderson Jorge dos Santos | BRA | 46,32 | |
| 7 | Chung Cheng-Kang | TPE | 47,85 | |
| 8 | Glauco Martini | SMR | 51,48 |
| 1 | Michael Blackwood | JAM | 45,58 | Q |
| 2 | Carlos Santa | DOM | 45,63 | Q |
| 3 | Alleyne Francique | GRN | 45,77 | q |
| 4 | Marcin Marciniszyn | POL | 45,97 | |
| 5 | Damion Barry | TRI | 46,20 | |
| 6 | Nery Brenes | CRC | 47,11 | |
| 7 | Ibrahim Ahmadov | AZE | 48,51 |
| 1 | Gary Kikaya | COD | 45,88 | Q |
| 2 | Lansford Spence | JAM | 46,21 | Q |
| 3 | Ofentse Mogawane | RSA | 46,80 | |
| 4 | Wilan Louis | BAR | 46,93 | |
| 5 | Prasanna Sampath Amarasekara | SRI | 47,11 | |
| 6 | Chris Meke Walasi | SOL | 49,47 | |
| Boubou Gandéga | MTN | DQ | ||
| Saul Weigopwa | NGR | DQ |
| 1 | Darold Williamson | USA | 45,97 | Q |
| 2 | Nagmeldin Ali Abubakr | SUD | 46,02 | Q |
| 3 | Malachi Davis | GBR | 46,14 | |
| 4 | Ato Modibo | TRI | 46,28 | |
| 5 | Leslie Djhone | FRA | 46,57 | |
| 6 | Chris Lloyd | DMA | 47,13 | |
| 7 | Moses Kamut | VAN | 48,63 |
| 1 | Brandon Simpson | JAM | 45,53 | Q |
| 2 | Andrew Rock | USA | 45,78 | Q |
| 3 | John Steffensen | AUS | 46,06 | q |
| 4 | Carlos Santa | DOM | 46,07 | |
| 5 | Alleyne Francique | GRN | 46,59 | |
| 6 | James Godday | NGR | 46,62 | |
| 7 | Hamdan Odha Al-Bishi | KSA | 46,80 | |
| 8 | Andrea Barberi | ITA | 47,10 |
| 1 | Tyler Christopher | CAN | 45,47 | Q |
| 2 | Darold Williamson | USA | 45,65 | Q |
| 3 | Timothy Benjamin | GBR | 45,66 | q |
| 4 | Arismendi Peguero | DOM | 46,08 | |
| 5 | Gary Kikaya | COD | 46,15 | |
| 6 | Nagmeldin Ali Abubakr | SUD | 46,67 | |
| 7 | Lansford Spence | JAM | 47,20 | |
| Sofiane Labidi | TUN | DNF |
| 1 | Jeremy Wariner | USA | 45,65 | Q |
| 2 | Christopher Brown | BAH | 45,67 | Q |
| 3 | Michael Blackwood | JAM | 46,25 | |
| 4 | Robert Tobin | GBR | 46,69 | |
| 5 | Pierre Lavanchy | SUI | 47,19 | |
| 6 | Talkmore Nyongani Young | ZIM | 47,20 | |
| 7 | California Molefe | BOT | 47,26 | |
| 8 | Mitsuhiro Sato | JPN | 48,55 |