# Swimming at the 2017 World Aquatics Championships – Men's 100 metre breaststroke

The Men's 100 metre breaststroke competition at the 2017 World Championships was held on 23 and 24 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Adam Peaty (GBR) | 57.13 | Rio de Janeiro, Brazil | 7 August 2016 |
| Competition record | Adam Peaty (GBR) | 58.18 | Kazan, Russia | 2 August 2015 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 23 July | Semifinal | Adam Peaty | Great Britain | 57.75 | CR |
| 24 July | Final | Adam Peaty | Great Britain | 57.47 | CR |

## Results
### Heats

The heats were held on 23 July at 11:17.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 8 | 4 | Adam Peaty | Great Britain | 58.21 | Q |
| 2 | 8 | 5 | Cody Miller | United States | 59.14 | Q |
| 3 | 6 | 4 | Kevin Cordes | United States | 59.15 | Q |
| 4 | 8 | 3 | João Gomes Júnior | Brazil | 59.24 | Q |
| 5 | 7 | 3 | Nicolò Martinenghi | Italy | 59.33 | Q, WJ |
| 6 | 8 | 7 | Kirill Prigoda | Russia | 59.36 | Q, NR |
| 7 | 6 | 3 | Ross Murdoch | Great Britain | 59.51 | Q |
| 8 | 6 | 2 | Vsevolod Zanko | Russia | 59.56 | Q |
| 9 | 6 | 5 | Yan Zibei | China | 59.61 | Q |
| 10 | 8 | 6 | Felipe Lima | Brazil | 59.62 | Q |
| 11 | 7 | 5 | Yasuhiro Koseki | Japan | 59.76 | Q |
| 12 | 7 | 2 | Giedrius Titenis | Lithuania | 59.79 | Q |
| 13 | 8 | 1 | Ilya Shymanovich | Belarus | 59.84 | Q |
| 14 | 7 | 1 | Richard Funk | Canada | 59.89 | Q |
| 15 | 8 | 8 | Andrius Šidlauskas | Lithuania | 59.91 | Q |
| 16 | 8 | 9 | Arno Kamminga | Netherlands | 59.95 | Q |
| 17 | 8 | 2 | Li Xiang | China | 59.97 | |
| 18 | 6 | 1 | Fabio Scozzoli | Italy | 1:00.08 | |
| 19 | 7 | 0 | Erik Persson | Sweden | 1:00.08 | NR |
| 20 | 6 | 0 | Daniel Cave | Australia | 1:00.22 | |
| 21 | 7 | 6 | Dmitriy Balandin | Kazakhstan | 1:00.25 | |
| 22 | 7 | 7 | Ippei Watanabe | Japan | 1:00.26 | |
| 23 | 8 | 0 | Čaba Silađi | Serbia | 1:00.28 | |
| 24 | 5 | 7 | Yannick Käser | Switzerland | 1:00.53 | NR |
| 25 | 6 | 6 | Christian vom Lehn | Germany | 1:00.60 | |
| 26 | 6 | 8 | Dániel Gyurta | Hungary | 1:00.76 | |
| 27 | 7 | 8 | Marcin Stolarski | Poland | 1:00.79 | |
| 28 | 7 | 9 | Carlos Claverie | Venezuela | 1:00.83 | |
| 29 | 4 | 1 | Tomáš Klobučník | Slovakia | 1:00.96 | |
| 30 | 6 | 7 | Jorge Murillo | Colombia | 1:01.51 | |
| 31 | 5 | 4 | Nicholas Quinn | Ireland | 1:01.56 | |
| 32 | 5 | 1 | Édgar Crespo | Panama | 1:01.74 | |
| 33 | 5 | 8 | Youssef El-Kamash | Egypt | 1:01.81 | |
| 34 | 5 | 6 | Kim Jae-youn | South Korea | 1:01.86 | |
| 35 | 6 | 9 | Laurent Carnol | Luxembourg | 1:01.91 | |
| 36 | 5 | 0 | Matti Mattsson | Finland | 1:01.92 | |
| 37 | 5 | 5 | Miguel de Lara | Mexico | 1:01.93 | |
| 38 | 5 | 9 | Ioannis Karpouzlis | Greece | 1:01.95 | |
| 39 | 4 | 5 | Lachezar Shumkov | Bulgaria | 1:01.96 | |
| 40 | 4 | 4 | Hüseyin Emre Sakçı | Turkey | 1:02.15 | |
| 41 | 4 | 3 | Christopher Rothbauer | Austria | 1:02.22 | |
| 42 | 5 | 3 | Azad Al-Barazi | Syria | 1:02.26 | |
| 43 | 3 | 4 | Chao Man Hou | Macau | 1:02.49 | |
| 44 | 4 | 2 | Renato Prono | Paraguay | 1:02.81 | |
| 45 | 4 | 0 | Nikola Obrovac | Croatia | 1:02.90 | |
| 46 | 3 | 5 | Jordy Groters | Aruba | 1:02.95 | |
| 47 | 5 | 2 | Peter John Stevens | Slovenia | 1:03.03 | |
| 48 | 3 | 6 | Denis Petrashov | Kyrgyzstan | 1:03.14 | |
| 49 | 4 | 7 | James Deiparine | Philippines | 1:03.22 | |
| 50 | 4 | 9 | Daniils Bobrovs | Latvia | 1:03.46 | |
| 51 | 3 | 3 | James Lawson | Zimbabwe | 1:03.52 | |
| 52 | 3 | 2 | Marc Rojas | Dominican Republic | 1:03.65 | |
| 53 | 1 | 8 | Santiago Cavanagh | Bolivia | 1:04.58 | |
| 54 | 3 | 8 | Sébastien Kouma | Mali | 1:05.03 | |
| 55 | 3 | 1 | Epeli Rabua | Fiji | 1:05.12 | |
| 56 | 1 | 2 | Evghenii Paponin | Moldova | 1:05.16 | |
| 56 | 3 | 9 | Gregory Penny | U.S. Virgin Islands | 1:05.16 | |
| 58 | 2 | 5 | Mario Ervedosa | Angola | 1:05.28 | NR |
| 59 | 1 | 6 | Santiago Saint-Upery | Uruguay | 1:05.30 | |
| 60 | 3 | 7 | Arnoldo Herrera | Costa Rica | 1:05.61 | |
| 61 | 2 | 7 | Amro Al-Wir | Jordan | 1:05.70 | |
| 62 | 2 | 3 | Rainier Rafaela | Curaçao | 1:06.96 | |
| 63 | 3 | 0 | Roland Toftum | Faroe Islands | 1:07.22 | |
| 64 | 2 | 0 | Felipe Gomes | Malawi | 1:07.37 | |
| 65 | 2 | 2 | Ashley Seeto | Papua New Guinea | 1:07.59 | |
| 66 | 1 | 4 | Muis Ahmad | Brunei | 1:08.10 | |
| 67 | 2 | 6 | Corey Ollivierre | Grenada | 1:08.17 | |
| 68 | 2 | 4 | Alex Axiotis | Zambia | 1:08.50 | |
| 69 | 1 | 7 | Otto Borgards | El Salvador | 1:10.62 | |
| 70 | 1 | 9 | Shuvam Shrestha | Nepal | 1:11.34 | NR |
| 71 | 1 | 1 | Abdulmalek Ben-Musa | Libya | 1:12.00 | |
| 72 | 1 | 3 | Christian Villacrusis | Northern Mariana Islands | 1:16.70 | |
| 73 | 1 | 5 | Alassane Lancina | Niger | 1:22.54 | |
| | 1 | 0 | Alpha Diallo | Guinea | DNS | DNS |
| | 2 | 1 | Dasar Xhambazi | Kosovo | DNS | DNS |
| | 2 | 8 | Jegan Jobe | Gambia | DNS | DNS |
| | 2 | 9 | Adama Ndir | Senegal | DNS | DNS |
| | 4 | 6 | Wassim Elloumi | Tunisia | DNS | DNS |
| | 7 | 4 | Cameron van der Burgh | South Africa | DNS | DNS |
| | 4 | 8 | Lee Hsuan-yen | Chinese Taipei | DSQ | DSQ |

### Semifinals

The semifinals were held on 23 July at 18:21.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Cody Miller | United States | 59.08 | Q |
| 2 | 3 | Kirill Prigoda | Russia | 59.24 | Q, NR |
| 3 | 2 | Felipe Lima | Brazil | 59.48 | |
| 4 | 5 | João Gomes Júnior | Brazil | 59.56 | |
| 5 | 7 | Giedrius Titenis | Lithuania | 59.66 | |
| 6 | 8 | Arno Kamminga | Netherlands | 59.76 | |
| 6 | 6 | Vsevolod Zanko | Russia | 59.76 | |
| 8 | 1 | Richard Funk | Canada | 59.92 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Adam Peaty | Great Britain | 57.75 | Q, CR |
| 2 | 5 | Kevin Cordes | United States | 58.64 | Q, AM |
| 3 | 8 | Andrius Šidlauskas | Lithuania | 59.12 | Q |
| 4 | 2 | Yan Zibei | China | 59.15 | Q |
| 5 | 7 | Yasuhiro Koseki | Japan | 59.18 | Q |
| 6 | 6 | Ross Murdoch | Great Britain | 59.23 | Q |
| 7 | 3 | Nicolò Martinenghi | Italy | 59.41 | |
| 8 | 1 | Ilya Shymanovich | Belarus | 1:00.01 | |

### Final

The final was held on 24 July at 17:32.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Adam Peaty | Great Britain | 57.47 | CR |
| | 5 | Kevin Cordes | United States | 58.79 | |
| | 8 | Kirill Prigoda | Russia | 59.05 | NR |
| 4 | 7 | Yasuhiro Koseki | Japan | 59.10 | |
| 5 | 3 | Cody Miller | United States | 59.11 | |
| 6 | 6 | Andrius Šidlauskas | Lithuania | 59.21 | |
| 7 | 2 | Yan Zibei | China | 59.42 | |
| 8 | 1 | Ross Murdoch | Great Britain | 59.45 | |