# Swimming at the 2019 World Aquatics Championships – Men's 100 metre breaststroke

The Men's 100 metre breaststroke competition at the 2019 World Championships was held on 21 and 22 July 2019. Adam Peaty broke the world record with a time of 56.88 in the semi-final, the first man to swim under 57 seconds in this event, and went on to win in the final.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Adam Peaty (GBR) | 57.10 | Glasgow, United Kingdom | 4 August 2018 |
| Competition record | Adam Peaty (GBR) | 57.47 | Budapest, Hungary | 24 July 2017 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 21 July | Semifinal | Adam Peaty | Great Britain | 56.88 | WR |

## Results
### Heats

The heats were held on 21 July at 11:54.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 9 | 4 | Adam Peaty | Great Britain | 57.59 | Q |
| 2 | 8 | 4 | Ilya Shymanovich | Belarus | 58.87 | Q |
| 3 | 9 | 5 | Yasuhiro Koseki | Japan | 58.91 | Q |
| 4 | 8 | 5 | Yan Zibei | China | 59.13 | Q |
| 5 | 7 | 4 | James Wilby | Great Britain | 59.15 | Q |
| 6 | 9 | 1 | Matthew Wilson | Australia | 59.17 | Q |
| 7 | 9 | 7 | João Gomes Júnior | Brazil | 59.25 | Q |
| 8 | 9 | 6 | Andrew Wilson | United States | 59.26 | Q |
| 9 | 9 | 3 | Anton Chupkov | Russia | 59.31 | Q |
| 10 | 8 | 6 | Kirill Prigoda | Russia | 59.32 | Q |
| 11 | 8 | 3 | Arno Kamminga | Netherlands | 59.39 | Q |
| 12 | 8 | 1 | Wang Lizhuo | China | 59.44 | Q |
| 13 | 8 | 2 | Dmitriy Balandin | Kazakhstan | 59.56 | Q |
| 14 | 7 | 6 | Nicolò Martinenghi | Italy | 59.58 | Q |
| 15 | 7 | 5 | Fabio Scozzoli | Italy | 59.61 | Q |
| 16 | 7 | 7 | Andrius Šidlauskas | Lithuania | 59.75 | Q |
| 17 | 8 | 8 | Darragh Greene | Ireland | 59.82 | NR |
| 18 | 8 | 7 | Felipe Lima | Brazil | 1:00.00 | |
| 19 | 9 | 2 | Michael Andrew | United States | 1:00.04 | |
| 20 | 7 | 1 | Fabian Schwingenschlögl | Germany | 1:00.12 | |
| 21 | 9 | 8 | Giedrius Titenis | Lithuania | 1:00.20 | |
| 22 | 7 | 2 | Berkay-Ömer Öğretir | Turkey | 1:00.26 | |
| 23 | 7 | 3 | Tobias Bjerg | Denmark | 1:00.29 | |
| 24 | 7 | 0 | Anton Sveinn McKee | Iceland | 1:00.32 | NR |
| 25 | 7 | 9 | Martin Allikvee | Estonia | 1:00.60 | |
| 26 | 8 | 9 | Erik Persson | Sweden | 1:00.66 | |
| 27 | 8 | 0 | Richard Funk | Canada | 1:00.73 | |
| 28 | 5 | 2 | Denis Petrashov | Kyrgyzstan | 1:00.94 | NR |
| 29 | 6 | 8 | Nikola Obrovac | Croatia | 1:01.18 | NR |
| 29 | 9 | 0 | Michael Houlie | South Africa | 1:01.18 | |
| 31 | 6 | 6 | Youssef El-Kamash | Egypt | 1:01.24 | |
| 31 | 7 | 8 | Moon Jae-kwon | South Korea | 1:01.24 | |
| 33 | 9 | 9 | Jorge Murillo | Colombia | 1:01.45 | |
| 34 | 6 | 9 | Jan Kałusowski | Poland | 1:01.49 | |
| 35 | 6 | 4 | Tomáš Klobučník | Slovakia | 1:01.65 | |
| 36 | 6 | 5 | Valentin Bayer | Austria | 1:01.68 | |
| 37 | 5 | 6 | Itay Goldfaden | Israel | 1:01.69 | |
| 38 | 6 | 2 | Yannick Käser | Switzerland | 1:01.85 | |
| 39 | 5 | 3 | Peter John Stevens | Slovenia | 1:01.90 | |
| 40 | 5 | 0 | Lyubomir Epitropov | Bulgaria | 1:02.04 | |
| 41 | 5 | 9 | Chao Man Hou | Macau | 1:02.14 | NR |
| 42 | 6 | 7 | Chen Chih-ming | Chinese Taipei | 1:02.18 | |
| 43 | 4 | 5 | Martin Melconian | Uruguay | 1:02.21 | NR |
| 44 | 5 | 5 | Renato Prono | Paraguay | 1:02.28 | |
| 45 | 5 | 1 | Miguel Chávez | Mexico | 1:02.37 | |
| 46 | 6 | 0 | Dávid Horváth | Hungary | 1:02.38 | |
| 47 | 6 | 3 | Vladislav Mustafin | Uzbekistan | 1:02.48 | |
| 48 | 5 | 4 | Édgar Crespo | Panama | 1:02.62 | |
| 49 | 5 | 7 | Lionel Khoo | Singapore | 1:02.66 | |
| 50 | 4 | 6 | Amro Al-Wir | Jordan | 1:02.75 | NR |
| 51 | 4 | 4 | James Deiparine | Philippines | 1:02.84 | |
| 52 | 5 | 8 | S.P. Likhith | India | 1:02.90 | |
| 53 | 4 | 9 | Adriel Sanes | Virgin Islands | 1:02.91 | NR |
| 54 | 4 | 3 | Taichi Vakasama | Fiji | 1:03.18 | |
| 55 | 4 | 7 | Daniils Bobrovs | Latvia | 1:03.32 | |
| 56 | 6 | 1 | Mykyta Koptyelov | Ukraine | 1:03.47 | |
| 57 | 4 | 8 | Julio Horrego | Honduras | 1:03.55 | |
| 58 | 4 | 2 | Izaak Bastian | Bahamas | 1:03.60 | |
| 59 | 4 | 0 | Sebastien Kouma | Mali | 1:04.03 | |
| 60 | 3 | 3 | Adrian Robinson | Botswana | 1:04.26 | NR |
| 61 | 1 | 7 | Benjamin Schulte | Guam | 1:04.40 | |
| 62 | 3 | 8 | Ryan Maskelyne | Papua New Guinea | 1:04.44 | |
| 63 | 4 | 1 | Fausto Huerta | Dominican Republic | 1:04.65 | |
| 64 | 3 | 4 | Yu Hin Michael Ng | Hong Kong | 1:04.66 | |
| 65 | 3 | 6 | Tasi Limtiaco | Federated States of Micronesia | 1:05.10 | |
| 66 | 3 | 7 | Ronan Wantenaar | Namibia | 1:05.17 | |
| 67 | 3 | 9 | Micah Masei | American Samoa | 1:05.24 | |
| 68 | 3 | 1 | Liam Davis | Zimbabwe | 1:05.39 | |
| 69 | 3 | 0 | Giacomo Casadei | San Marino | 1:05.96 | NR |
| 70 | 1 | 2 | Rashed Al-Tarmoom | Kuwait | 1:06.35 | |
| 71 | 2 | 2 | Rainier Rafaela | Curaçao | 1:06.41 | |
| 72 | 3 | 2 | Arnoldo Herrera | Costa Rica | 1:06.42 | |
| 73 | 3 | 5 | Santiago Cavanagh | Bolivia | 1:06.44 | |
| 74 | 1 | 1 | Muhammad Isa Ahmad | Brunei | 1:06.51 | |
| 75 | 1 | 6 | Jonathan Raharvel | Madagascar | 1:06.53 | |
| 76 | 2 | 6 | Malcolm Richardson | Cook Islands | 1:06.64 | |
| 77 | 2 | 5 | Filipe Gomes | Malawi | 1:07.51 | |
| 78 | 2 | 4 | Mohammad Islam | Bangladesh | 1:07.74 | |
| 79 | 2 | 3 | Günsennorovyn Zandanbal | Mongolia | 1:07.92 | |
| 80 | 2 | 1 | Alex Joachim | Saint Vincent and the Grenadines | 1:08.14 | |
| 81 | 1 | 5 | Amini Fonua | Tonga | 1:08.32 | |
| 82 | 2 | 7 | Abobakr Abass | Sudan | 1:09.34 | |
| 83 | 2 | 0 | Kumaren Naidu | Zambia | 1:10.13 | |
| 84 | 2 | 8 | Shuvam Shrestha | Nepal | 1:11.74 | |
| 85 | 1 | 3 | Yaya Yeressa | Guinea | 1:19.66 | |
| 86 | 1 | 4 | Lennosuke Suzuki | Northern Mariana Islands | 1:20.97 | |
| 87 | 2 | 9 | Gildas Koumondji | Benin | 1:26.57 | |

### Semifinals

The semifinals were held on 21 July at 20:51.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Yan Zibei | China | 58.67 | Q, AS |
| 2 | 6 | Andrew Wilson | United States | 58.95 | Q |
| 3 | 2 | Kirill Prigoda | Russia | 59.21 | Q |
| 4 | 3 | Matthew Wilson | Australia | 59.26 | |
| 5 | 4 | Ilya Shymanovich | Belarus | 59.38 | |
| 6 | 8 | Andrius Šidlauskas | Lithuania | 59.66 | |
| 7 | 7 | Wang Lizhuo | China | 59.79 | |
| | 1 | Nicolò Martinenghi | Italy | DSQ | DSQ |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Adam Peaty | Great Britain | 56.88 | Q, WR |
| 2 | 3 | James Wilby | Great Britain | 58.83 | Q |
| 3 | 5 | Yasuhiro Koseki | Japan | 58.89 | Q |
| 4 | 1 | Dmitriy Balandin | Kazakhstan | 59.03 | Q, NR |
| 5 | 2 | Anton Chupkov | Russia | 59.15 | Q |
| 6 | 8 | Fabio Scozzoli | Italy | 59.22 | |
| 7 | 6 | João Gomes Júnior | Brazil | 59.32 | |
| 8 | 7 | Arno Kamminga | Netherlands | 59.49 | |

### Final

The final was held on 22 July at 20:02.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Adam Peaty | Great Britain | 57.14 | |
| | 3 | James Wilby | Great Britain | 58.46 | |
| | 5 | Yan Zibei | China | 58.63 | AS |
| 4 | 6 | Yasuhiro Koseki | Japan | 58.93 | |
| 5 | 8 | Kirill Prigoda | Russia | 59.09 | |
| 6 | 2 | Andrew Wilson | United States | 59.11 | |
| 7 | 7 | Dmitriy Balandin | Kazakhstan | 59.14 | |
| 8 | 1 | Anton Chupkov | Russia | 59.19 | |