| Semifinal - 21.08.04 | | Heat 1 | Time | Team | | 1. Jeremy Wariner | USA | 44.87s | | 2. Michael Blackwood | Jam | 45.00s | | 3. Leslie Djhone | Fra | 45.01s | | 4. Lewis Banda | Zim | 45.23s | | 4. Eric Milazar | Mri | 45.23s | | 6. Gary Kikaya | Cod | 45.58s | | 7. Ezra Sambu | Ken | 45.84s | | 8. Cedric van Branteghem | Bel | 46.03s | | Heat 2 | Time | Team | | 1. Derrick Brew | USA | 45.05s | | 2. Davian Clarke | Jam | 45.27s | | 3. Christopher Brown | Bah | 45.31s | | 4. Geyman Lopez | Cub | 45.52s | | 5. Alejandro Cardenas | Mex | 45.64s | | 6. K Mathews Binu | Ind | 45.97s | | 7. Matija Sestak | Slv | 46.54s | | - Anton Galkin | Rus | Disq. | | Heat 3 | Time | Team | | 1. Brandon Simpson | Jam | 44.97s | | 2. Otis Harris | USA | 44.99s | | 3. Alleyne Francique | Grn | 45.08s | | 4. Carlos Santa | Dom | 45.58s | | 5. Hamdan O Al Bishi | Sau | 45.59s | | 6. Saul Weigopwa | Nig | 45.67s | | 7. Ingo Schultz | Ger | 46.23s | | 8. Timothey Benjamin | Gbr | 46.28s |
| | Round 1 - 20.08.04 | | Heat 1 | Time | Team | | 1. Alleyne Francique | Grn | 45.32s | | 2. Davian Clarke | Jam | 45.54s | | 3. Marcus la Grange | Rsa | 45.95s | | 4. Piotr Klimczak | Pol | 46.23s | | 5. Jun Osakada | Jpn | 46.39s | | 6. Lloyd Zvasiya | Zim | 47.19s | | 7. David Canal | Spa | 47.23s | | 8. Danilson Ricciuli | Gui | 49.27s | | Heat 2 | Team | Time | | 1. Christopher Brown | Bah | 45.09s SB | | 2. Otis Harris | USA | 45.11s | | 3. Eric Milazar | Mri | 45.34s | | 4. Casey Vincent | Aus | 46.09s | | 5. Vincent Mumo Kiilu | Ken | 46.31s | | 6. Andres Silva | Uru | 46.48s | | 7. Stilianos Dimotsios | Gre | 46.51s SB | | 8. Abdulla Mohamed Hussein | Som | 51.52s | | Heat 3 | Team | Time | | 1. Geyman Lopez | Cub | 45.44s | | 2. Alejandro Cardenas | Mex | 45.46s | | 3. Gary Kikaya | Cod | 45.57s | | 4. Ato Modibo | Tri | 46.29s | | 5. Mitsuhiro Sato | Jpn | 46.70s | | 6. Takeshi Fujiwara | Esa | 48.46s | | 7. Youba Hmeida | Mtn | 49.18s | | - Anton Galkin | Rus | Disq | | Heat 4 | Team | Time | | 1. Derrick Brew | USA | 45.41s | | 2. Brandon Simpson | Jam | 45.61s | | 3. Sofiane Labidi | Tun | 46.04s | | 4. Daniel Caines | Gbr | 46.15s | | 5. Rohan Pradeep Kumara | Sri | 46.20s | | 6. Evans Marie | Sey | 48.23s PB | | - Lezin Christian Elongo Ngoyikonda | Cgo | DNS | | Heat 5 | Team | Time | | 1. Carlos Santa | Dom | 45.31s | | 2. Lewis Banda | Zim | 45.37s | | 3. K Mathews Binu | Ind | 45.48s NR | | 4. Cedric van Branteghem | Bel | 45.70s | | 5. Calfornia Molefe | Bot | 45.88s | | 6. Chris Lloyd | Dmc | 47.98s | | 7. Fawzi Al Shammari | Kuw | 48.25s | | 8. Saeed Al Adhreai | Yem | 49.39s | | Heat 6 | Team | Time | | 1. Jeremy Wariner | USA | 45.56s | | 2. Ingo Schultz | Ger | 45.88s | | 3. Young Talkmore Nyongani | Zim | 46.03s | | 4. Zsolt Szeglet | Hun | 46.16s | | 5. Malachi Davis | Gbr | 46.28s | | 6. Oleg Mishukov | Rus | 46.41s | | 7. Dadi Denis | Hai | 47.57s | | - Victor Kibet | Ken | DNF | | Heat 7 | Team | Time | | 1. Michael Blackwood | Jam | 45.23s | | 2. Hamdan O Al Bishi | Sau | 45.31s | | 3. Saul Weigopwa | Nig | 45.59s | | 4. Matija Sestak | Slv | 45.88s | | 5. Yuki Yamaguchi | Jpn | 46.16s | | 6. Nagmeldin Ali Abubakr | Sud | 46.32s | | 7. Sajid Muhammad | Pak | 47.45s SB | | 8. Moses Kamut | Van | 48.14s SB | | Heat 8 | Team | Time | | 1. Leslie Djhone | Fra | 45.40s | | 2. Ezra Sambu | Ken | 45.59s | | 3. Timothey Benjamin | Gbr | 45.69s | | 4. Clinton Hill | Aus | 45.89s | | 5. Adem Hecini | Alg | 46.50s | | 6. Luis Luna | Ven | 47.92s | | 7. Jonni Lowe | Hon | 48.06s | | 8. Anderson Jorge Oliveira dos Santos | Bra | 48.77s |
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