# Swimming at the 2004 Summer Olympics – Men's 100 metre butterfly

The men's 100 metre butterfly event at the 2004 Olympic Games was contested at the Olympic Aquatic Centre of the Athens Olympic Sports Complex in Athens, Greece on August 19 and 20.
U.S. swimmer Michael Phelps broke an Olympic record of 51.25 to claim his fifth gold medal, edging out his teammate and world record holder Ian Crocker by four hundredths of a second (0.04). Meanwhile, Ukraine's Andriy Serdinov earned a bronze in a European record of 51.36. Earlier in the semifinals, Serdinov blasted a new Olympic record, previously set by Australia's Geoff Huegill in Sydney four years ago, with a time of 51.74. One heat later, Phelps stopped the clock at 51.61 to lower the record by 0.13 of a second.

## Records

Prior to this competition, the existing world and Olympic records were as follows.
| World record | Ian Crocker (USA) | 50.76 | Long Beach, United States | 13 July 2004 |
| Olympic record | Geoff Huegill (AUS) | 51.96 | Sydney, Australia | 21 September 2000 |
The following new world and Olympic records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| August 19 | Semifinal 1 | Andriy Serdinov | Ukraine | 51.74 | OR |
| August 19 | Semifinal 2 | Michael Phelps | United States | 51.61 | OR |
| August 20 | Final | Michael Phelps | United States | 51.25 | OR |

## Results
### Heats

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 8 | 4 | Ian Crocker | United States | 52.03 | Q |
| 2 | 6 | 4 | Andriy Serdinov | Ukraine | 52.05 | Q |
| 3 | 7 | 4 | Michael Phelps | United States | 52.35 | Q |
| 4 | 5 | 4 | Milorad Čavić | Serbia and Montenegro | 52.44 | Q |
| 5 | 7 | 7 | Geoff Huegill | Australia | 52.54 | Q |
| 6 | 7 | 1 | Duje Draganja | Croatia | 52.56 | Q |
| 7 | 7 | 5 | Thomas Rupprath | Germany | 52.57 | Q |
| 8 | 8 | 3 | Franck Esposito | France | 52.61 | Q |
| 9 | 8 | 5 | Igor Marchenko | Russia | 52.62 | Q |
| 10 | 7 | 6 | Takashi Yamamoto | Japan | 52.71 | Q |
| 11 | 8 | 2 | Gabriel Mangabeira | Brazil | 52.76 | Q |
| 12 | 7 | 2 | James Hickman | Great Britain | 52.91 | Q |
| 13 | 6 | 3 | Yevgeny Korotyshkin | Russia | 52.93 | Q |
| 14 | 8 | 6 | Mike Mintenko | Canada | 52.96 | Q |
| 15 | 7 | 3 | Corney Swanepoel | New Zealand | 53.07 | Q |
| 16 | 8 | 7 | Helge Meeuw | Germany | 53.11 | Q |
| 17 | 8 | 8 | Kaio Almeida | Brazil | 53.22 | |
| 18 | 5 | 1 | Ryan Pini | Papua New Guinea | 53.26 | |
| 19 | 6 | 6 | Joris Keizer | Netherlands | 53.41 | |
| 20 | 8 | 1 | Adam Pine | Australia | 53.45 | |
| 21 | 6 | 2 | Denys Sylantyev | Ukraine | 53.46 | |
| 22 | 6 | 5 | Todd Cooper | Great Britain | 53.48 | |
| 23 | 6 | 1 | Mattia Nalesso | Italy | 53.49 | |
| 24 | 5 | 7 | Simão Morgado | Portugal | 53.53 | |
| 25 | 5 | 5 | Frederick Bousquet | France | 53.63 | |
| 26 | 5 | 6 | Pavel Lagoun | Belarus | 53.87 | |
| 27 | 7 | 8 | Ioan Gherghel | Romania | 53.89 | |
| 28 | 4 | 4 | Jere Hård | Finland | 54.02 | |
| 29 | 4 | 6 | Peter Mankoč | Slovenia | 54.14 | |
| 30 | 6 | 8 | Eugene Botes | South Africa | 54.15 | |
| 31 | 4 | 5 | Sotirios Pastras | Greece | 54.20 | |
| 32 | 5 | 2 | Erik Andersson | Sweden | 54.26 | |
| 33 | 6 | 7 | Joshua Ilika Brenner | Mexico | 54.29 | |
| 34 | 5 | 3 | Zsolt Gáspár | Hungary | 54.43 | |
| 35 | 4 | 1 | Rimvydas Šalčius | Lithuania | 54.46 | |
| 36 | 5 | 8 | Luis Rojas | Venezuela | 54.58 | |
| 37 | 4 | 2 | Camilo Becerra | Colombia | 54.71 | |
| 38 | 3 | 5 | Jeong Doo-hee | South Korea | 54.76 | |
| 39 | 2 | 3 | Michal Rubáček | Czech Republic | 54.87 | |
| 40 | 4 | 7 | Georgi Palazov | Bulgaria | 54.91 | |
| 41 | 3 | 7 | Rustam Khudiyev | Kazakhstan | 55.03 | |
| 42 | 3 | 2 | Hjörtur Már Reynisson | Iceland | 55.12 | |
| 43 | 4 | 3 | Wu Peng | China | 55.17 | |
| 44 | 3 | 4 | Eduardo Germán Otero | Argentina | 55.24 | |
| 45 | 3 | 3 | Aleksandar Miladinovski | Macedonia | 55.71 | |
| 46 | 2 | 6 | Oleg Lyashko | Uzbekistan | 55.90 | |
| 47 | 3 | 1 | Juan Pablo Valdivieso | Peru | 55.98 | |
| 48 | 3 | 6 | Aghiles Slimani | Algeria | 56.22 | |
| 49 | 3 | 8 | Onur Uras | Turkey | 56.37 | |
| 50 | 2 | 5 | Nicholas Rees | Bahamas | 56.39 | |
| 51 | 2 | 8 | Gordon Touw Ngie Tjouw | Suriname | 56.68 | |
| 52 | 2 | 2 | Conrad Francis | Sri Lanka | 56.80 | |
| 53 | 4 | 8 | Andrejs Dūda | Latvia | 56.81 | |
| 54 | 2 | 4 | Andy Wibowo | Indonesia | 56.86 | |
| 55 | 2 | 7 | Daniel O'Keeffe | Guam | 57.39 | |
| 56 | 2 | 1 | Davy Bisslik | Aruba | 57.85 | |
| 57 | 1 | 5 | Luis Matias | Angola | 58.92 | |
| 58 | 1 | 4 | Fernando Medrano Medina | Nicaragua | 1:00.91 | |
| 59 | 1 | 3 | Rad Aweisat | Palestine | 1:01.60 | |

### Semifinals
#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Andriy Serdinov | Ukraine | 51.74 | Q, OR |
| 2 | 3 | Duje Draganja | Croatia | 52.74 | Q |
| 3 | 2 | Takashi Yamamoto | Japan | 52.81 | |
| 4 | 6 | Franck Esposito | France | 52.88 | |
| 5 | 1 | Mike Mintenko | Canada | 52.89 | |
| 6 | 8 | Helge Meeuw | Germany | 52.99 | |
| 7 | 7 | James Hickman | Great Britain | 53.10 | |
| 8 | 5 | Milorad Čavić | Serbia and Montenegro | 53.12 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Michael Phelps | United States | 51.61 | Q, OR |
| 2 | 4 | Ian Crocker | United States | 51.83 | Q |
| 3 | 2 | Igor Marchenko | Russia | 52.32 | Q |
| 4 | 7 | Gabriel Mangabeira | Brazil | 52.33 | Q |
| 5 | 3 | Geoff Huegill | Australia | 52.64 | Q |
| 6 | 6 | Thomas Rupprath | Germany | 52.71 | Q |
| 7 | 1 | Yevgeny Korotyshkin | Russia | 52.85 | |
| 8 | 8 | Corney Swanepoel | New Zealand | 52.99 | |

### Final

| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Michael Phelps | United States | 51.25 | OR |
| | 3 | Ian Crocker | United States | 51.29 | |
| | 5 | Andriy Serdinov | Ukraine | 51.36 | EU |
| 4 | 1 | Thomas Rupprath | Germany | 52.27 | |
| 5 | 6 | Igor Marchenko | Russia | 52.32 | |
| 6 | 2 | Gabriel Mangabeira | Brazil | 52.34 | |
| 7 | 8 | Duje Draganja | Croatia | 52.46 | |
| 8 | 7 | Geoff Huegill | Australia | 52.56 | |