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Date: 20 August 2004
Summary
Final 1
| Rank | Name | Nation | Time |
| 1 | Michael Phelps | USA | 51.25 |
| 2 | Ian Crocker | USA | 51.29 |
| 3 | Andriy Serdinov | UKR | 51.36 |
| 4 | Thomas Rupprath | GER | 52.27 |
| 5 | Igor Marchenko | RUS | 52.32 |
| 6 | Gabriel Mangabeira | BRA | 52.34 |
| 7 | Duje Draganja | CRO | 52.46 |
| 8 | Geoffrey Huegill | AUS | 52.56 |