# Swimming at the 2009 World Aquatics Championships – Men's 100 metre butterfly

The men's 100 metre butterfly event at the 2009 World Aquatics Championships took place between 31 July – 1 August at the Foro Italico. Both the heats and semifinals were held on 31 July with the heats being held in the morning session and the semifinals being held in the evening session. The final was held on 1 August.

## Records

Prior to this competition, the existing world and competition records were as follows:
| World record | Michael Phelps (USA) | 50.22 | Indianapolis, United States | 9 July 2009 |
| Championship record | Ian Crocker (USA) | 50.40 | Montreal, Canada | 30 July 2005 |
The following records were established during the competition:
| Date | Round | Name | Nationality | Time | Record |
| 31 July | Semifinal 2 | Milorad Čavić | Serbia | 50.01 | WR |
| 1 August | Final | Michael Phelps | United States | 49.82 | WR |

## Results
### Heats

| Rank | Name | Nationality | Time | Heat | Lane | Notes |
| 1 | Milorad Čavić | Serbia | 50.56 | 15 | 4 | NR |
| 2 | Tyler McGill | United States | 50.90 | 15 | 5 | |
| 2 | Michael Phelps | United States | 50.90 | 17 | 4 | |
| 4 | Andrew Lauterstein | Australia | 50.93 | 16 | 5 | |
| 5 | Albert Subirats | Venezuela | 51.02 | 17 | 7 | SA |
| 6 | Gabriel Mangabeira | Brazil | 51.11 | 17 | 3 | NR |
| 7 | Ivan Lenđer | Serbia | 51.22 | 15 | 7 | |
| 7 | Benjamin Starke | Germany | 51.22 | 16 | 6 | NR |
| 9 | Takuro Fujii | Japan | 51.24 | 15 | 3 | AS |
| 10 | Rafael Muñoz | Spain | 51.40 | 16 | 4 | |
| 11 | Peter Mankoč | Slovenia | 51.49 | 16 | 3 | |
| 12 | Yevgeny Korotyshkin | Russia | 51.51 | 15 | 6 | NR |
| 13 | Nikolay Skvortsov | Russia | 51.58 | 15 | 1 | |
| 14 | Michael Rock | Great Britain | 51.65 | 16 | 8 | NR |
| 15 | Corney Swanepoel | New Zealand | 51.71 | 17 | 2 | |
| 16 | Jason Dunford | Kenya | 51.76 | 17 | 5 | |
| 17 | Ryan Pini | Papua New Guinea | 51.81 | 16 | 2 | |
| 17 | Clement Lefert | France | 51.81 | 17 | 6 | |
| 19 | Joeri Verlinden | Netherlands | 51.97 | 14 | 4 | NR |
| 19 | Helge Meeuw | Germany | 51.97 | 15 | 9 | |
| 21 | Adam Pine | Australia | 51.98 | 17 | 0 | |
| 22 | Michal Rubáček | Czech Republic | 51.99 | 12 | 2 | |
| 23 | Robin van Aggele | Netherlands | 52.04 | 14 | 3 | |
| 24 | Pavel Sankovich | Belarus | 52.05 | 13 | 5 | |
| 25 | Zhou Jiawei | China | 52.08 | 14 | 2 | |
| 25 | Lyndon Ferns | South Africa | 52.08 | 15 | 8 | |
| 27 | Mario Todorović | Croatia | 52.09 | 14 | 5 | |
| 28 | Moss Burmester | New Zealand | 52.13 | 17 | 8 | |
| 29 | Kaio de Almeida | Brazil | 52.14 | 15 | 2 | |
| 30 | Denys Dubrov | Ukraine | 52.21 | 13 | 9 | |
| 31 | Simon Sjödin | Sweden | 52.27 | 13 | 8 | |
| 31 | Lars Frölander | Sweden | 52.27 | 16 | 9 | |
| 33 | Masayuki Kishida | Japan | 52.28 | 17 | 1 | |
| 34 | Jakob Andkjær | Denmark | 52.34 | 15 | 0 | |
| 35 | Douglas Lennox-Silva | Puerto Rico | 52.39 | 12 | 4 | NR |
| 36 | Pablo Marmolejo | Mexico | 52.48 | 12 | 8 | NR |
| 37 | Jeong Doohee | South Korea | 52.50 | 12 | 3 | |
| 38 | Mattia Nalesso | Italy | 52.55 | 14 | 7 | |
| 38 | Ian Hulme | Great Britain | 52.55 | 17 | 9 | |
| 40 | Joe Bartoch | Canada | 52.60 | 14 | 9 | |
| 41 | Alex Villaecija | Spain | 52.61 | 16 | 7 | |
| 42 | Sergiy Breus | Ukraine | 52.63 | 13 | 0 | |
| 43 | Shi Feng | China | 52.64 | 16 | 1 | |
| 44 | Alon Mandel | Israel | 52.68 | 13 | 1 | NR |
| 45 | Marcin Babuchowski | Poland | 52.75 | 14 | 8 | |
| 46 | Vytautas Janušaitis | Lithuania | 52.76 | 11 | 5 | |
| 47 | Stefanos Dimitriadis | Greece | 52.89 | 13 | 3 | |
| 48 | Pavels Kondrahins | Latvia | 52.92 | 10 | 4 | |
| 48 | Evgeny Lazuka | Belarus | 52.92 | 12 | 7 | |
| 50 | Diogo Carvalho | Portugal | 52.94 | 14 | 6 | |
| 51 | Simão Morgado | Portugal | 52.98 | 13 | 4 | |
| 52 | Jan Šefl | Czech Republic | 52.99 | 13 | 7 | |
| 53 | Darian Townsend | South Africa | 53.04 | 16 | 0 | |
| 54 | Marcin Tarczyński | Poland | 53.06 | 14 | 1 | |
| 55 | Shaune Fraser | Cayman Islands | 53.07 | 11 | 2 | |
| 56 | Octavio Alesi | Venezuela | 53.12 | 12 | 1 | |
| 56 | François Heersbrandt | Belgium | 53.12 | 14 | 0 | |
| 58 | Emil Dall-Nielsen | Denmark | 53.20 | 13 | 6 | |
| 58 | Rimvydas Salcius | Lithuania | 53.20 | 13 | 2 | |
| 60 | Gustavo Daniel Paschetta | Argentina | 53.30 | 11 | 7 | |
| 61 | Daniel Bego | Malaysia | 53.33 | 11 | 1 | |
| 62 | Andrejs Dūda | Latvia | 53.41 | 12 | 0 | |
| 63 | Elvis Burrows | Bahamas | 53.51 | 11 | 9 | NR |
| 64 | Alexandru Felix Maestru | Romania | 53.61 | 11 | 3 | |
| 65 | Damien Courtois | Switzerland | 53.91 | 10 | 3 | |
| 66 | Bernhard Wolf | Austria | 53.98 | 11 | 4 | |
| 67 | Rustam Khudiyev | Kazakhstan | 54.01 | 10 | 6 | |
| 67 | Alexandre Bakhtiarov | Cyprus | 54.01 | 10 | 1 | |
| 69 | Mathieu Fonteyn | Belgium | 54.02 | 12 | 9 | |
| 70 | Emmanuel Crescimbeni | Peru | 54.08 | 8 | 3 | NR |
| 71 | Nadav Kochavi | Israel | 54.20 | 9 | 4 | |
| 72 | Hsu Chi-Chieh | Chinese Taipei | 54.34 | 10 | 7 | |
| 73 | Stanislav Kuzmin | Kazakhstan | 54.41 | 10 | 0 | |
| 74 | Romāns Miloslavskis | Latvia | 54.42 | 8 | 9 | |
| 75 | Israel Duran | Mexico | 54.52 | 10 | 8 | |
| 76 | Serkan Atasay | Turkey | 54.66 | 10 | 2 | |
| 77 | Sten Indrikson | Estonia | 54.73 | 9 | 3 | |
| 78 | Martin Liivamägi | Estonia | 54.74 | 9 | 6 | |
| 79 | Yu Jeongnam | South Korea | 54.78 | 10 | 5 | |
| 80 | Tan Xue Wei Nicholas | Singapore | 54.84 | 9 | 8 | |
| 81 | Grant Beahan | Zimbabwe | 54.89 | 8 | 4 | NR |
| 82 | Goksu Bicer | Turkey | 54.93 | 9 | 5 | |
| 83 | Bader Almuhana | Saudi Arabia | 55.11 | 9 | 2 | |
| 84 | Andres Jose Gonzalez | Argentina | 55.23 | 10 | 9 | |
| 85 | Virdhawal Khade | India | 55.28 | 11 | 6 | |
| 86 | Rehan Poncha | India | 55.29 | 7 | 3 | |
| 87 | Nguyen Vo Thai | Vietnam | 55.37 | 7 | 5 | |
| 88 | Branden Whitehurst | Virgin Islands | 55.46 | 5 | 1 | NR |
| 89 | Sergey Pankov | Uzbekistan | 55.48 | 8 | 6 | |
| 90 | Carlos Viveros Madariaga | Colombia | 55.55 | 9 | 1 | |
| 91 | Norbert Trudman | Slovakia | 55.90 | 11 | 0 | |
| 92 | Glenn Victor Sutanto | Indonesia | 55.92 | 11 | 8 | |
| 93 | Favio Persano | Paraguay | 55.93 | 8 | 2 | |
| 94 | Taki Mrabet | Tunisia | 55.94 | 9 | 7 | |
| 95 | Hajder Ensar | Bosnia and Herzegovina | 56.17 | 7 | 2 | |
| 96 | James Walsh | Philippines | 56.38 | 6 | 4 | |
| 97 | Conor Leaney | Ireland | 56.39 | 9 | 9 | |
| 98 | Brad Hamilton | Jamaica | 56.56 | 6 | 0 | NR |
| 99 | Endi Babi | Albania | 56.58 | 5 | 5 | |
| 100 | Wong Wing Cheung Victor | Macau | 56.65 | 9 | 0 | |
| 101 | Phillipe Mailliard Rodriguez | Chile | 56.68 | 6 | 3 | |
| 102 | Bruno Miguel Esquen Blas | Peru | 56.80 | 8 | 8 | |
| 103 | Emin Noshadi | Iran | 56.84 | 6 | 1 | |
| 104 | Pedro Pinotes | Angola | 56.92 | 5 | 0 | |
| 105 | Obaid Al-Jasmi | United Arab Emirates | 56.96 | 7 | 7 | |
| 105 | Joao Matias | Angola | 56.96 | 7 | 0 | |
| 107 | Alexander Ray | Namibia | 56.97 | 4 | 5 | |
| 108 | Teymur Guliyev | Azerbaijan | 57.06 | 8 | 7 | |
| 109 | Sim Ri Jin Nicholas | Singapore | 57.10 | 7 | 6 | |
| 110 | Serghei Golban | Moldova | 57.14 | 5 | 2 | |
| 111 | Roy Felipe Barahona Fuentes | Honduras | 57.15 | 7 | 4 | |
| 112 | Radhames Kalaf | Dominican Republic | 57.33 | 5 | 7 | |
| 113 | Yellow Yeiyah | Nigeria | 57.37 | 4 | 3 | |
| 114 | Javier Hernandez Maradiaga | Honduras | 57.41 | 8 | 5 | |
| 115 | Marcelino Richaards | Suriname | 57.44 | 6 | 2 | |
| 116 | Miguel Navarro | Bolivia | 57.48 | 5 | 8 | |
| 117 | Fernando Castellanos | Guatemala | 57.75 | 5 | 9 | |
| 118 | Nather Ahmed Alhamoud | Saudi Arabia | 57.82 | 6 | 6 | |
| 119 | Joel Romeu Lemarchand | Uruguay | 57.97 | 7 | 9 | |
| 120 | Kareem Ennab | Jordan | 57.99 | 4 | 6 | |
| 121 | Serghei Falcas | Moldova | 58.12 | 5 | 6 | |
| 122 | Byron Briedenhann | Namibia | 58.28 | 4 | 2 | |
| 123 | Luke Hall | Eswatini | 58.55 | 5 | 4 | |
| 124 | Ryan Nelthropp | United States Virgin Islands | 58.65 | 4 | 7 | |
| 125 | Aleksei Klimenko | Kyrgyzstan | 58.69 | 8 | 1 | |
| 126 | Alejandro Madde Madde | Bolivia | 58.72 | 4 | 1 | |
| 127 | Abbas Raad | Lebanon | 58.77 | 6 | 9 | |
| 128 | Ali Al Kaabi | United Arab Emirates | 58.81 | 4 | 4 | |
| 129 | Pietro Camilloni | San Marino | 58.99 | 5 | 3 | |
| 130 | Nasir Ali | Pakistan | 59.12 | 4 | 9 | |
| 131 | Chong Cheok Kuan | Macau | 59.22 | 6 | 8 | |
| 132 | Rashid Iunusov | Kyrgyzstan | 59.40 | 7 | 1 | |
| 133 | Timothy Ferris | Zimbabwe | 59.49 | 6 | 7 | |
| 134 | Andrey Molchanov | Turkmenistan | 59.68 | 2 | 7 | |
| 135 | Fernando Medrano | Nicaragua | 59.80 | 3 | 4 | |
| 136 | Neil Agius | Malta | 59.86 | 3 | 6 | |
| 137 | Jon Pepaj | Albania | 1:00.05 | 7 | 8 | |
| 138 | Niall Christopher Roberts | Guyana | 1:00.53 | 4 | 8 | |
| 139 | Heimanu Sichan | French Polynesia | 1:00.55 | 3 | 3 | |
| 140 | Colin Bensadon | Gibraltar | 1:00.56 | 3 | 7 | |
| 141 | Jean Marie Emmanuel Froge | Mauritius | 1:00.86 | 3 | 8 | |
| 142 | Benjamin Gabbard | American Samoa | 1:00.87 | 3 | 9 | |
| 143 | Moh'D Aqelah | Jordan | 1:00.97 | 4 | 0 | |
| 144 | Papa Madiop Ndong | Senegal | 1:01.03 | 3 | 2 | |
| 145 | Paul Elaisa | Fiji | 1:02.40 | 2 | 1 | |
| 146 | Gerusio Matonse | Mozambique | 1:03.36 | 3 | 0 | |
| 147 | Anthony Clark | French Polynesia | 1:03.37 | 2 | 6 | |
| 148 | Milimo Mweetwa | Zambia | 1:03.86 | 2 | 2 | |
| 149 | Jean Hugues Gregoire | Mauritius | 1:03.89 | 2 | 5 | |
| 150 | Peter Popahun Pokawin | Papua New Guinea | 1:04.62 | 2 | 8 | |
| 151 | Narantsog Tsogjargal | Mongolia | 1:05.01 | 2 | 4 | |
| 152 | Sergey Pevnev | Armenia | 1:05.15 | 3 | 1 | |
| 153 | Ali Mohamed Raaidh | Maldives | 1:10.10 | 2 | 9 | |
| 154 | Mohamed Mujahid | Maldives | 1:10.32 | 1 | 4 | |
| 155 | Johnny Rivera | Guam | 1:10.49 | 1 | 5 | |
| 156 | Ingabire-Ahishakiye Gael | Burundi | 1:19.25 | 2 | 0 | |
| – | Duje Draganja | Croatia | DNS | 1 | 3 | |
| – | Achelhi Bilal | Morocco | DNS | 3 | 5 | |
| – | Rami Anis | Syria | DNS | 6 | 5 | |
| – | Édgar Crespo | Panama | DNS | 8 | 0 | |
| – | Omar Pinzón | Colombia | DNS | 12 | 5 | |
| – | Stefan Hirniak | Canada | DNS | 12 | 6 | |
| – | Jean-Luc Augier | Saint Lucia | DSQ | 2 | 3 | |

### Semifinals

| Rank | Name | Nationality | Time | Heat | Lane | Notes |
| 1 | Milorad Čavić | Serbia | 50.01 | 2 | 4 | WR |
| 2 | Michael Phelps | United States | 50.48 | 1 | 4 | |
| 3 | Rafael Muñoz | Spain | 50.59 | 1 | 2 | |
| 4 | Albert Subirats | Venezuela | 50.65 | 2 | 3 | SA |
| 5 | Jason Dunford | Kenya | 50.78 | 1 | 8 | AF |
| 6 | Gabriel Mangabeira | Brazil | 51.02 | 1 | 3 | NR |
| 7 | Andrew Lauterstein | Australia | 51.03 | 1 | 5 | |
| 8 | Tyler McGill | United States | 51.07 | 2 | 5 | |
| 9 | Yevgeny Korotyshkin | Russia | 51.26 | 1 | 7 | NR |
| 10 | Benjamin Starke | Germany | 51.31 | 1 | 6 | |
| 11 | Takuro Fujii | Japan | 51.32 | 2 | 2 | |
| 11 | Ivan Lenđer | Serbia | 51.32 | 2 | 6 | |
| 13 | Michael Rock | Great Britain | 51.41 | 1 | 1 | NR |
| 14 | Nikolay Skvortsov | Russia | 51.50 | 2 | 1 | |
| 15 | Peter Mankoč | Slovenia | 51.54 | 2 | 7 | |
| 16 | Corney Swanepoel | New Zealand | 51.79 | 2 | 8 | |

### Final

| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Michael Phelps | United States | 49.82 | WR |
| | 4 | Milorad Čavić | Serbia | 49.95 | ER |
| | 3 | Rafael Muñoz | Spain | 50.41 | NR |
| 4 | 6 | Albert Subirats | Venezuela | 50.79 | |
| 5 | 1 | Andrew Lauterstein | Australia | 50.85 | OC |
| 6 | 2 | Jason Dunford | Kenya | 51.07 | |
| 7 | 8 | Tyler McGill | United States | 51.42 | |
| 8 | 7 | Gabriel Mangabeira | Brazil | 51.74 | |