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Date: 19 August 2004
Summary
Semi-final 1
| Rank | Name | Nation | Time |
| 1 | Andriy Serdinov | UKR | 51.74 |
| 2 | Duje Draganja | CRO | 52.74 |
| 3 | Takashi Yamamoto | JPN | 52.81 |
| 4 | Franck Esposito | FRA | 52.88 |
| 5 | Michael Mintenko | CAN | 52.89 |
| 6 | Helge Meeuw | GER | 52.99 |
| 7 | James Hickman | GBR | 53.10 |
| 8 | Milorad Cavic | SCG | 53.12 |
| Rank | Name | Nation | Time |
| 1 | Michael Phelps | USA | 51.61 |
| 2 | Ian Crocker | USA | 51.83 |
| 3 | Igor Marchenko | RUS | 52.32 |
| 4 | Gabriel Mangabeira | BRA | 52.33 |
| 5 | Geoffrey Huegill | AUS | 52.64 |
| 6 | Thomas Rupprath | GER | 52.71 |
| 7 | Evgeny Korotyshkin | RUS | 52.85 |
| 8 | Corney Swanepoel | NZL | 52.99 |