# Swimming at the 2017 World Aquatics Championships – Men's 50 metre breaststroke

The Men's 50 metre breaststroke competition at the 2017 World Championships was held on 25 and 26 July 2017.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Adam Peaty (GBR) | 26.42 | Kazan, Russia | 4 August 2015 |
| Competition record | Adam Peaty (GBR) | 26.42 | Kazan, Russia | 4 August 2015 |
The following new records were set during this competition.
| Date | Event | Name | Nationality | Time | Record |
| 25 July | Heat | Adam Peaty | Great Britain | 26.10 | WR, CR |
| 25 July | Semifinal | Adam Peaty | Great Britain | 25.95 | WR, CR |

## Results
### Heats

The heats were held on 25 July at 09:30.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 9 | 4 | Adam Peaty | Great Britain | 26.10 | Q, WR |
| 2 | 8 | 5 | Cameron van der Burgh | South Africa | 26.54 | Q, AF |
| 3 | 8 | 4 | João Gomes Júnior | Brazil | 26.67 | Q, AM |
| 4 | 7 | 4 | Kevin Cordes | United States | 26.83 | Q |
| 5 | 7 | 3 | Kirill Prigoda | Russia | 26.91 | Q, NR |
| 6 | 9 | 3 | Felipe Lima | Brazil | 26.93 | Q |
| 7 | 9 | 5 | Ilya Shymanovich | Belarus | 27.01 | Q, NR |
| 8 | 8 | 2 | Fabio Scozzoli | Italy | 27.04 | Q |
| 9 | 7 | 5 | Nicolò Martinenghi | Italy | 27.08 | Q |
| 10 | 7 | 6 | Yasuhiro Koseki | Japan | 27.21 | Q, AS |
| 11 | 9 | 7 | Giedrius Titenis | Lithuania | 27.24 | Q |
| 12 | 7 | 2 | Yan Zibei | China | 27.25 | Q, NR |
| 13 | 8 | 7 | Čaba Silađi | Serbia | 27.27 | Q |
| 13 | 9 | 6 | Johannes Skagius | Sweden | 27.27 | Q |
| 15 | 9 | 2 | Cody Miller | United States | 27.31 | Q |
| 16 | 8 | 3 | Peter Stevens | Slovenia | 27.39 | QSO |
| 16 | 9 | 1 | Arno Kamminga | Netherlands | 27.39 | QSO, NR |
| 16 | 8 | 6 | Vsevolod Zanko | Russia | 27.39 | QSO |
| 19 | 9 | 8 | Richard Funk | Canada | 27.59 | |
| 20 | 7 | 7 | Nikola Obrovac | Croatia | 27.61 | |
| 21 | 6 | 2 | Ari-Pekka Liukkonen | Finland | 27.66 | |
| 22 | 8 | 1 | Jorge Murillo | Colombia | 27.67 | |
| 23 | 8 | 0 | Christian vom Lehn | Germany | 27.68 | |
| 24 | 6 | 3 | Matthew Wilson | Australia | 27.69 | |
| 25 | 7 | 1 | Marcin Stolarski | Poland | 27.73 | |
| 26 | 8 | 9 | Dmitriy Balandin | Kazakhstan | 27.74 | |
| 27 | 9 | 0 | Youssef El-Kamash | Egypt | 27.79 | |
| 27 | 9 | 9 | Renato Prono | Paraguay | 27.79 | |
| 29 | 6 | 1 | Yannick Käser | Switzerland | 27.84 | |
| 30 | 6 | 5 | Hüseyin Emre Sakçı | Turkey | 27.90 | |
| 31 | 7 | 0 | Marek Botík | Slovakia | 27.92 | |
| 32 | 7 | 8 | Édgar Crespo | Panama | 27.93 | |
| 33 | 8 | 8 | Lachezar Shumkov | Bulgaria | 28.07 | |
| 33 | 7 | 9 | Ioannis Karpouzlis | Greece | 28.07 | |
| 35 | 6 | 6 | Martín Melconian | Uruguay | 28.10 | |
| 36 | 5 | 5 | James Deiparine | Philippines | 28.13 | |
| 36 | 6 | 7 | Azad Al-Barazi | Syria | 28.13 | |
| 38 | 6 | 4 | Nikolajs Maskaļenko | Latvia | 28.27 | |
| 39 | 6 | 9 | Carlos Claverie | Venezuela | 28.28 | |
| 40 | 5 | 2 | Miguel de Lara | Mexico | 28.29 | |
| 41 | 5 | 6 | Filipp Provorkov | Estonia | 28.37 | |
| 42 | 5 | 7 | Jordy Groters | Aruba | 28.40 | |
| 43 | 6 | 8 | Gábor Financsek | Hungary | 28.44 | |
| 44 | 5 | 4 | Indra Gunawan | Indonesia | 28.50 | |
| 45 | 5 | 1 | Kirill Vais | Kyrgyzstan | 28.61 | |
| 46 | 6 | 0 | Wu Chun-feng | Chinese Taipei | 28.75 | |
| 47 | 4 | 5 | James Lawson | Zimbabwe | 28.85 | =NR |
| 48 | 4 | 3 | Mario Ervedosa | Angola | 29.26 | |
| 49 | 2 | 4 | Santiago Cavanagh | Bolivia | 29.29 | |
| 50 | 4 | 1 | Evghenii Paponin | Moldova | 29.42 | |
| 51 | 4 | 2 | N'Nhyn Fernander | Bahamas | 29.75 | |
| 52 | 5 | 8 | Marc Rojas | Dominican Republic | 29.84 | |
| 53 | 4 | 0 | Sebastien Kouma | Mali | 29.92 | |
| 54 | 5 | 0 | Corey Ollivierre | Grenada | 29.94 | |
| 55 | 4 | 4 | Gregory Penny | U.S. Virgin Islands | 29.96 | |
| 56 | 4 | 7 | Rainier Rafaela | Curaçao | 29.97 | |
| 57 | 5 | 9 | Roland Toftum | Faroe Islands | 30.16 | |
| 58 | 3 | 4 | Ronan Wantenaar | Namibia | 30.27 | |
| 59 | 3 | 5 | Ashley Seeto | Papua New Guinea | 30.30 | |
| 60 | 4 | 6 | Abdoul Niane | Senegal | 30.31 | |
| 61 | 2 | 1 | Adrian Robinson | Botswana | 30.38 | |
| 62 | 4 | 8 | Epeli Rabua | Fiji | 30.44 | |
| 63 | 4 | 9 | Alex Axiotis | Zambia | 30.65 | |
| 64 | 1 | 4 | Muis Ahmad | Brunei | 30.73 | |
| 65 | 3 | 3 | Anthony Souaiby | Lebanon | 30.84 | |
| 66 | 2 | 5 | Dionisio Augustine | Micronesia | 32.28 | |
| 66 | 2 | 7 | Tindwende Sawadogo | Burkina Faso | 32.38 | |
| 68 | 3 | 2 | Shuvam Shrestha | Nepal | 32.50 | |
| 69 | 3 | 0 | Slava Sihanouvong | Laos | 32.60 | |
| 70 | 2 | 6 | Adil Bharmal | Tanzania | 32.67 | |
| 71 | 2 | 3 | Joshua Tibatemwa | Uganda | 32.77 | |
| 72 | 1 | 5 | Abdulmalik Ben Musa | Libya | 32.92 | |
| 73 | 1 | 2 | Simanga Dlamini | Eswatini | 33.07 | |
| 74 | 3 | 1 | Alassane Seydou | Niger | 35.00 | |
| 75 | 3 | 7 | Moris Beale | Sierra Leone | 35.13 | |
| 76 | 1 | 3 | Ramziyor Khorkashov | Tajikistan | 35.52 | |
| 77 | 3 | 6 | Ablam Awoussou | Benin | 36.34 | |
| 78 | 1 | 6 | Athoumane Solihi | Comoros | 36.61 | |
| 79 | 3 | 9 | Hamid Rahimi | Afghanistan | 37.95 | |
| 80 | 2 | 2 | Ebrahim Al-Maleki | Yemen | 38.98 | |
| 81 | 3 | 8 | Houssein Gaber | Djibouti | 40.55 | |
| | 2 | 0 | Dasar Xhambazi | Kosovo | DNS | DNS |
| | 5 | 3 | Wassim Elloumi | Tunisia | DNS | DNS |
| | 2 | 8 | Jegan Jobe | Gambia | DNS | DNS |

### Swim-off

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Peter Stevens | Slovenia | 27.38 | Q |
| 2 | 5 | Vsevolod Zanko | Russia | 27.41 | |
| 3 | 3 | Arno Kamminga | Netherlands | 27.43 | |

### Semifinals

The semifinals were held on 25 July at 18:11.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 3 | Felipe Lima | Brazil | 26.68 | Q |
| 2 | 4 | Cameron van der Burgh | South Africa | 26.74 | Q |
| 3 | 5 | Kevin Cordes | United States | 26.86 | Q |
| 4 | 6 | Fabio Scozzoli | Italy | 26.96 | Q, NR |
| 5 | 1 | Johannes Skagius | Sweden | 27.02 | NR |
| 6 | 2 | Yasuhiro Koseki | Japan | 27.17 | AS |
| 7 | 8 | Peter Stevens | Slovenia | 27.20 | |
| 8 | 7 | Yan Zibei | China | 27.33 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Adam Peaty | Great Britain | 25.95 | Q, WR |
| 2 | 3 | Kirill Prigoda | Russia | 26.85 | Q, NR |
| 3 | 5 | João Gomes Júnior | Brazil | 26.86 | Q |
| 4 | 6 | Ilya Shymanovich | Belarus | 26.90 | Q, NR |
| 5 | 2 | Nicolò Martinenghi | Italy | 27.01 | |
| 6 | 1 | Čaba Silađi | Serbia | 27.18 | |
| 7 | 7 | Giedrius Titenis | Lithuania | 27.24 | |
| 8 | 8 | Cody Miller | United States | 27.46 | |

### Final

The final was held on 26 July at 18:17.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 4 | Adam Peaty | Great Britain | 25.99 | |
| | 7 | João Gomes Júnior | Brazil | 26.52 | AM |
| | 3 | Cameron van der Burgh | South Africa | 26.60 | |
| 4 | 5 | Felipe Lima | Brazil | 26.78 | |
| 5 | 2 | Kevin Cordes | United States | 26.80 | |
| 6 | 8 | Fabio Scozzoli | Italy | 26.91 | NR |
| 7 | 6 | Kirill Prigoda | Russia | 27.01 | |
| 8 | 1 | Ilya Shymanovich | Belarus | 27.27 | |