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

The men's 100 metre backstroke at the 2009 World Championships took place Monday 27 July (prelims and semifinals) and on the evening of Tuesday 28 July (final) at the Foro Italico in Rome, Italy.

## Records

Prior to this competition, the existing world and competition records were as follows:
| World record | Aaron Peirsol (USA) | 51.94 | Indianapolis, United States | 8 July 2009 |
| Championship record | Aaron Peirsol (USA) | 52.98 | Melbourne, Australia | 27 March 2007 |
The following records were established during the competition:
| Date | Round | Name | Nationality | Time | Record |
| 27 July | Heat 12 | Aschwin Wildeboer | Spain | 52.93 | CR |
| 27 July | Semifinal 1 | Junya Koga | Japan | 52.39 | CR |
| 28 July | Final | Junya Koga | Japan | 52.26 | CR |

## Results
### Heats

| Rank | Name | Nationality | Time | Heat | Lane | Notes |
| 1 | Aschwin Wildeboer | Spain | 52.93 | 12 | 4 | CR |
| 2 | Ryosuke Irie | Japan | 53.00 | 11 | 4 | |
| 3 | Liam Tancock | Great Britain | 53.08 | 11 | 3 | NR |
| 3 | Junya Koga | Japan | 53.08 | 13 | 5 | |
| 3 | Aaron Peirsol | United States | 53.08 | 13 | 4 | |
| 6 | Helge Meeuw | Germany | 53.28 | 13 | 3 | |
| 7 | Ashley Delaney | Australia | 53.33 | 12 | 6 | |
| 8 | Markus Rogan | Austria | 53.62 | 11 | 2 | |
| 9 | Jérémy Stravius | France | 53.67 | 12 | 3 | |
| 10 | Arkady Vyatchanin | Russia | 53.73 | 11 | 5 | |
| 11 | Mirco di Tora | Italy | 53.77 | 12 | 7 | NR |
| 12 | Juan Miguel Rando | Spain | 53.89 | 10 | 0 | |
| 12 | Stanislav Donets | Russia | 53.89 | 11 | 6 | |
| 14 | Nicolaas Driebergen | Netherlands | 53.94 | 10 | 5 | NR |
| 14 | Aristeidis Grigoriadis | Greece | 53.94 | 13 | 2 | |
| 16 | Matt Grevers | United States | 54.04 | 12 | 5 | |
| 17 | Pascal Wollach | Canada | 54.08 | 12 | 2 | |
| 18 | Guilherme Guido | Brazil | 54.17 | 13 | 7 | |
| 19 | Benjamin Stasiulis | Lithuania | 54.18 | 13 | 6 | |
| 20 | George Du Rand | South Africa | 54.29 | 11 | 8 | |
| 21 | Răzvan Florea | Romania | 54.47 | 13 | 1 | |
| 22 | Guy Barnea | Israel | 54.51 | 13 | 8 | |
| 23 | Daniel Bell | New Zealand | 54.58 | 13 | 0 | |
| 24 | Marco Loughran | Great Britain | 54.61 | 11 | 1 | |
| 25 | Leonardo Guedes | Brazil | 54.64 | 12 | 1 | |
| 26 | Radosław Kawęcki | Poland | 54.66 | 11 | 0 | NR |
| 27 | Charl Van Zyl | South Africa | 54.67 | 10 | 6 | |
| 28 | Karl Burdis | Ireland | 54.74 | 10 | 9 | NR |
| 29 | Damiano Lestingi | Italy | 54.77 | 11 | 7 | |
| 30 | Omar Pinzón | Colombia | 54.97 | 11 | 9 | NR |
| 31 | Jake Tapp | Canada | 54.99 | 12 | 0 | |
| 32 | Robert Hurley | Australia | 55.18 | 12 | 8 | |
| 33 | He Jianbin | China | 55.24 | 10 | 7 | |
| 34 | Sung Min | South Korea | 55.39 | 12 | 9 | |
| 35 | Cheng Feiyi | China | 55.52 | 13 | 9 | |
| 36 | Sebastian Stoss | Austria | 55.57 | 9 | 6 | |
| 37 | Derya Büyükuncu | Turkey | 55.78 | 10 | 4 | |
| 38 | Flori Lang | Switzerland | 55.84 | 10 | 3 | |
| 39 | Tomas Fucik | Czech Republic | 56.10 | 8 | 7 | |
| 39 | Andriy Kovbasa | Ukraine | 56.10 | 10 | 1 | |
| 41 | Itai Chammah | Israel | 56.15 | 1 | 5 | |
| 41 | Donal O'Neill | Ireland | 56.15 | 10 | 8 | |
| 43 | Krzysztof Jankiewicz | Poland | 56.23 | 10 | 2 | |
| 44 | Bruno Claeys | Belgium | 56.34 | 9 | 4 | |
| 45 | Andres Olvik | Estonia | 56.37 | 8 | 2 | NR |
| 46 | Dimitrios Chasiotis | Greece | 56.58 | 9 | 1 | |
| 47 | Pedro Oliveira | Portugal | 56.69 | 9 | 8 | |
| 48 | Danil Bugakov | Uzbekistan | 56.77 | 9 | 3 | |
| 49 | Alexandru Felix Maestru | Romania | 56.80 | 8 | 1 | |
| 50 | Martin Liivamägi | Estonia | 57.00 | 8 | 8 | |
| 51 | Stanislav Osinsky | Kazakhstan | 57.02 | 8 | 5 | |
| 52 | Pedro Medel | Cuba | 57.03 | 9 | 2 | |
| 53 | Miguel Robles | Mexico | 57.14 | 9 | 7 | |
| 54 | Robi Zbogar | Slovenia | 57.45 | 8 | 3 | |
| 55 | Jean-François Schneiders | Luxembourg | 57.49 | 8 | 4 | |
| 56 | Konstantins Bohins | Latvia | 57.68 | 7 | 6 | |
| 57 | Naoufel Benabid | Algeria | 57.81 | 7 | 5 | NR |
| 58 | Kouam Amine | Morocco | 57.95 | 7 | 8 | NR |
| 59 | Andrejs Dūda | Latvia | 58.00 | 7 | 2 | |
| 60 | Raphaël Stacchiotti | Luxembourg | 58.03 | 9 | 0 | |
| 61 | Glenn Victor Sutanto | Indonesia | 58.29 | 7 | 7 | |
| 62 | Ng Kai Wee Raine | Singapore | 58.57 | 7 | 4 | |
| 63 | Cheah Geoffrey Robin | Hong Kong | 58.69 | 7 | 3 | |
| 64 | David Rodriguez | Cuba | 58.70 | 7 | 1 | |
| 65 | Do Huy Long | Vietnam | 58.79 | 7 | 0 | |
| 66 | Tsung Chao-Lin | Chinese Taipei | 58.93 | 8 | 9 | |
| 67 | Nicolas Francia Viña | Uruguay | 58.94 | 9 | 5 | |
| 68 | Artiom Gladun | Moldova | 58.97 | 9 | 9 | |
| 69 | Rony Bakale | Republic of the Congo | 59.10 | 6 | 6 | |
| 70 | Yury Zaharov | Kyrgyzstan | 59.13 | 8 | 6 | |
| 71 | Serghei Golban | Moldova | 59.16 | 6 | 3 | |
| 72 | Heshan Bandara Unamboowe | Sri Lanka | 59.47 | 4 | 9 | |
| 73 | Achelhi Bilal | Morocco | 59.49 | 5 | 1 | |
| 74 | Jean Luis Gomez | Dominican Republic | 1:00.16 | 6 | 7 | |
| 75 | Doğa Çelik | Turkey | 1:00.22 | 8 | 0 | |
| 76 | Khachik Plavchyan | Armenia | 1:00.31 | 6 | 5 | |
| 77 | Nicholas James | Zimbabwe | 1:00.34 | 5 | 5 | |
| 78 | Boris Kirillov | Azerbaijan | 1:00.44 | 5 | 8 | |
| 79 | Radomyos Matjiur | Thailand | 1:00.61 | 6 | 4 | |
| 80 | Byron Briedenhann | Namibia | 1:00.85 | 5 | 9 | |
| 81 | Ashwin Menon | India | 1:00.90 | 5 | 3 | |
| 82 | Mohammed Al Ghaferi | United Arab Emirates | 1:01.18 | 5 | 6 | |
| 83 | Antonio Tong | Macau | 1:01.41 | 5 | 4 | |
| 84 | Marcelino Richaards | Suriname | 1:01.65 | 4 | 5 | |
| 85 | Ryan Nelthropp | United States Virgin Islands | 1:01.69 | 4 | 2 | |
| 86 | Kari Joannesarson Hoevdanum | Faroe Islands | 1:01.70 | 6 | 1 | |
| 87 | Fernando Castellanos | Guatemala | 1:01.92 | 3 | 4 | |
| 88 | Alberto Tasini | San Marino | 1:02.18 | 5 | 0 | |
| 89 | Yousuf Essa Al Yousuf | Saudi Arabia | 1:02.28 | 6 | 2 | |
| 90 | Armando Zayas Claure | Bolivia | 1:02.87 | 3 | 5 | |
| 91 | Abbas Raad | Lebanon | 1:03.28 | 6 | 9 | |
| 92 | Ngou Pok Man | Macau | 1:03.69 | 4 | 7 | |
| 93 | Praveen Tokas | India | 1:03.74 | 6 | 8 | |
| 94 | Samson Opuakpo | Nigeria | 1:03.81 | 3 | 1 | |
| 95 | Benjamin Gabbard | American Samoa | 1:03.86 | 3 | 9 | |
| 96 | Javier Hernandez Maradiaga | Honduras | 1:03.98 | 6 | 0 | |
| 97 | Nicholas Coard | Grenada | 1:04.02 | 4 | 1 | |
| 98 | Ronny Vencatachellum | Mauritius | 1:04.11 | 4 | 8 | |
| 99 | Tural Abbasov | Azerbaijan | 1:04.47 | 5 | 7 | |
| 100 | Matar Samb | Senegal | 1:04.71 | 5 | 2 | |
| 101 | Mark Sammut | Malta | 1:05.08 | 4 | 3 | |
| 102 | Edward Caruana Dingli | Malta | 1:05.43 | 3 | 7 | |
| 103 | Vincent Perry | French Polynesia | 1:05.72 | 4 | 6 | |
| 104 | Juan Carlos Sikaffy Diaz | Honduras | 1:06.01 | 3 | 8 | |
| 105 | Batsaikhan Dulguun | Mongolia | 1:06.96 | 4 | 0 | |
| 106 | Mathieu Marquet | Mauritius | 1:07.26 | 2 | 4 | |
| 107 | Sidni Hoxha | Albania | 1:08.15 | 4 | 4 | |
| 108 | Saif Alaslam Saeed Alsaadi | Iraq | 1:08.21 | 1 | 4 | |
| 109 | Paul Elaisa | Fiji | 1:08.81 | 2 | 8 | |
| 110 | Siu Kent Chung | Brunei | 1:08.98 | 3 | 2 | |
| 111 | Carlos Alberto | Angola | 1:09.14 | 2 | 3 | |
| 112 | Timur Atahanov | Turkmenistan | 1:09.42 | 2 | 2 | |
| 112 | Gary Pineda | Guatemala | 1:09.42 | 3 | 0 | |
| 114 | Pepelate Gbagi | Nigeria | 1:10.45 | 2 | 6 | |
| 115 | Elaijie Erasito | Fiji | 1:11.00 | 2 | 7 | |
| 116 | Nadir Elmofti | Libya | 1:16.32 | 2 | 1 | |
| 117 | Shameel Ibrahim | Maldives | 1:19.06 | 2 | 0 | |
| — | Mario Sulkja | Albania | DNS | 2 | 5 | |
| — | Hocine Haciane | Andorra | DNS | 3 | 6 | |
| — | Brett Fraser | Cayman Islands | DNS | 7 | 9 | |
| — | Faiz Muhammad | Pakistan | DSQ | 3 | 3 | |

### Semifinals

| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 1 | 5 | Junya Koga | Japan | 52.39 | CR, AS |
| 2 | 1 | 3 | Helge Meeuw | Germany | 52.49 | NR |
| 3 | 1 | 4 | Ryosuke Irie | Japan | 52.73 | |
| 4 | 2 | 4 | Aschwin Wildeboer | Spain | 52.76 | |
| 5 | 1 | 8 | Matt Grevers | United States | 52.82 | |
| 6 | 2 | 8 | Aristeidis Grigoriadis | Greece | 53.03 | NR |
| 7 | 1 | 2 | Arkady Vyatchanin | Russia | 53.11 | |
| 8 | 2 | 5 | Liam Tancock | Great Britain | 53.12 | |
| 9 | 2 | 3 | Aaron Peirsol | United States | 53.22 | |
| 10 | 2 | 6 | Ashley Delaney | Australia | 53.24 | |
| 11 | 1 | 6 | Markus Rogan | Austria | 53.40 | |
| 12 | 2 | 2 | Jérémy Stravius | France | 53.82 | |
| 13 | 2 | 7 | Mirco di Tora | Italy | 53.88 | |
| 14 | 1 | 1 | Nicolaas Driebergen | Netherlands | 53.92 | NR |
| 15 | 1 | 7 | Juan Miguel Rando | Spain | 54.13 | |
| 16 | 2 | 1 | Stanislav Donets | Russia | 54.24 | |

### Final

| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Junya Koga | Japan | 52.26 | CR, AS |
| | 5 | Helge Meeuw | Germany | 52.54 | |
| | 6 | Aschwin Wildeboer | Spain | 52.64 | |
| 4 | 3 | Ryosuke Irie | Japan | 52.73 | |
| 4 | 8 | Liam Tancock | Great Britain | 52.73 | NR |
| 6 | 1 | Arkady Vyatchanin | Russia | 52.87 | NR |
| 7 | 2 | Matt Grevers | United States | 53.14 | |
| 8 | 7 | Aristeidis Grigoriadis | Greece | 53.43 | |