# 2021 FINA World Swimming Championships (25 m) – Men's 100 metre breaststroke

The Men's 100 metre breaststroke competition of the 2021 FINA World Swimming Championships (25 m) was held on 16 and 17 December 2021.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Ilya Shymanovich (BLR) | 55.28 | Eindhoven, Netherlands | 26 November 2021 |
| Competition record | Cameron van der Burgh (RSA) | 56.01 | Hangzhou, China | 12 December 2018 |
The following new records were set during this competition:
| Date | Event | Name | Nation | Time | Record |
| 17 December | Final | Ilya Shymanovich | Belarus | 55.70 | CR |

## Results
### Heats

The heats were started on 16 December at 11:35.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 7 | 5 | Arno Kamminga | Netherlands | 56.19 | Q |
| 2 | 7 | 4 | Ilya Shymanovich | Belarus | 56.20 | Q |
| 3 | 6 | 5 | Nic Fink | United States | 57.02 | Q |
| 4 | 5 | 5 | Fabian Schwingenschlögl | Germany | 57.07 | Q |
| 5 | 6 | 4 | Nicolò Martinenghi | Italy | 57.43 | Q |
| 6 | 5 | 1 | Yan Zibei | China | 57.45 | Q |
| 7 | 5 | 2 | Antoine Viquerat | France | 57.53 | Q |
| 8 | 7 | 7 | Michael Andrew | United States | 57.54 | Q |
| 9 | 7 | 3 | Danil Semianinov | Russian Swimming Federation | 57.66 | Q |
| 10 | 6 | 7 | Matěj Zábojník | Czech Republic | 57.71 | Q, NR |
| 11 | 6 | 3 | Bernhard Reitshammer | Austria | 57.76 | Q |
| 12 | 6 | 6 | Berkay Ömer Öğretir | Turkey | 57.79 | Q |
| 13 | 5 | 6 | Erik Persson | Sweden | 57.86 | Q |
| 14 | 6 | 0 | Qin Haiyang | China | 57.88 | Q |
| 15 | 7 | 0 | Lucas Matzerath | Germany | 58.07 | Q |
| 16 | 5 | 3 | Oleg Kostin | Russian Swimming Federation | 58.11 | Q |
| 17 | 7 | 2 | Christopher Rothbauer | Austria | 58.12 | |
| 18 | 7 | 6 | Tobias Bjerg | Denmark | 58.17 | |
| 19 | 7 | 9 | Lyubomir Epitropov | Bulgaria | 58.27 | NR |
| 20 | 5 | 7 | Olli Kokko | Finland | 58.31 | |
| 21 | 6 | 2 | Andrius Šidlauskas | Lithuania | 58.33 | |
| 22 | 4 | 5 | Josué Domínguez | Dominican Republic | 58.44 | NR |
| 23 | 7 | 1 | Kristian Pitshugin | Israel | 58.49 | |
| 24 | 2 | 2 | Jadon Wuilliez | Antigua and Barbuda | 58.73 | NR |
| 25 | 4 | 1 | Julio Horrego | Honduras | 58.80 | NR |
| 26 | 4 | 0 | Youssef El-Kamash | Egypt | 59.18 | NR |
| 27 | 6 | 9 | Volodymyr Lisovets | Ukraine | 59.25 | |
| 28 | 6 | 8 | André Klippenberg Grindheim | Norway | 59.26 | |
| 29 | 5 | 8 | Tomáš Klobučník | Slovakia | 59.35 | |
| 30 | 3 | 7 | Mariano Lazzerini | Chile | 59.61 | NR |
| 30 | 4 | 3 | Izaak Bastian | Bahamas | 59.61 | NR |
| 32 | 3 | 5 | Phạm Thanh Bảo | Vietnam | 1:00.05 | |
| 33 | 4 | 8 | Constantin Malachi | Moldova | 1:00.37 | NR |
| 34 | 3 | 2 | Adriel Sanes | United States Virgin Islands | 1:00.59 | NR |
| 35 | 4 | 7 | Miguel de Lara | Mexico | 1:00.61 | |
| 36 | 3 | 6 | Sebastian Cook | Philippines | 1:00.75 | |
| 37 | 3 | 4 | Abobakr Abass | Sudan | 1:01.15 | NR |
| 38 | 2 | 4 | Kledi Kadiu | Albania | 1:01.34 | |
| 38 | 3 | 1 | Alexandre Grand'Pierre | Haiti | 1:01.34 | NR |
| 40 | 4 | 9 | Ronan Wantenaar | Namibia | 1:01.36 | |
| 41 | 3 | 3 | Martin Melconian | Uruguay | 1:01.58 | |
| 42 | 4 | 2 | Patrick Pelegrina | Andorra | 1:01.99 | |
| 43 | 2 | 5 | Arnoldo Herrera | Costa Rica | 1:02.24 | |
| 44 | 3 | 0 | Giacomo Casadei | San Marino | 1:02.86 | NR |
| 45 | 3 | 9 | Filipe Gomes | Malawi | 1:03.21 | |
| 46 | 2 | 3 | Liam Davis | Zimbabwe | 1:03.29 | |
| 47 | 3 | 8 | Jonathan Chung Yee | Mauritius | 1:03.78 | |
| 48 | 2 | 6 | Muhammad Isa Ahmad | Brunei | 1:04.09 | |
| 49 | 4 | 6 | Sébastien Kouma | Mali | 1:04.16 | |
| 50 | 1 | 5 | Saud Ghali | Bahrain | 1:04.82 | |
| 51 | 2 | 7 | Bransly Dirksz | Aruba | 1:05.32 | |
| 52 | 2 | 0 | Marc Dansou | Benin | 1:07.33 | |
| 53 | 2 | 8 | Bryson George | Saint Vincent and the Grenadines | 1:07.73 | |
| 54 | 1 | 6 | Ahmed Al-Hassani | Iraq | 1:07.98 | |
| 55 | 2 | 1 | Omar Al-Hatem | Kuwait | 1:08.40 | |
| 56 | 1 | 3 | Mohamed Hammad | United Arab Emirates | 1:08.94 | |
| | 1 | 4 | João Gomes Júnior | Brazil | DSQ | |
| | 2 | 9 | Mohamed Kamara | Sierra Leone | DSQ | |
| | 4 | 4 | Michael Ng | Hong Kong | DSQ | |
| | 5 | 0 | Cho Sung-jae | South Korea | DSQ | |
| | 5 | 4 | Emre Sakçı | Turkey | DSQ | |
| | 6 | 1 | Denis Petrashov | Kyrgyzstan | DSQ | |
| | 5 | 9 | Jorge Murillo | Colombia | DNS | |
| | 7 | 8 | Maximillian Ang | Singapore | DNS | |

### Semifinals

The semifinals were started on 16 December at 19:06.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 2 | 4 | Arno Kamminga | Netherlands | 56.41 | Q |
| 2 | 2 | 5 | Nic Fink | United States | 56.48 | Q |
| 3 | 1 | 4 | Ilya Shymanovich | Belarus | 56.54 | Q |
| 4 | 1 | 5 | Fabian Schwingenschlögl | Germany | 56.80 | Q |
| 5 | 2 | 3 | Nicolò Martinenghi | Italy | 56.81 | Q |
| 6 | 1 | 3 | Yan Zibei | China | 57.19 | Q |
| 7 | 1 | 1 | Qin Haiyang | China | 57.23 | Q |
| 8 | 1 | 7 | Berkay Ömer Öğretir | Turkey | 57.34 | Q |
| 9 | 2 | 2 | Danil Semianinov | Russian Swimming Federation | 57.39 | |
| 10 | 2 | 6 | Antoine Viquerat | France | 57.53 | |
| 11 | 2 | 8 | Lucas Matzerath | Germany | 57.57 | |
| 12 | 1 | 2 | Matěj Zábojník | Czech Republic | 57.59 | NR |
| 13 | 2 | 7 | Bernhard Reitshammer | Austria | 57.68 | |
| 14 | 1 | 6 | Michael Andrew | United States | 57.83 | |
| 15 | 2 | 1 | Erik Persson | Sweden | 57.86 | |
| 16 | 1 | 8 | Oleg Kostin | Russian Swimming Federation | 58.08 | |

### Final

The final was held on 17 December at 18:28.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 3 | Ilya Shymanovich | Belarus | 55.70 | CR |
| | 2 | Nicolò Martinenghi | Italy | 55.80 | |
| | 5 | Nic Fink | United States | 55.87 | |
| 4 | 4 | Arno Kamminga | Netherlands | 56.06 | |
| 5 | 6 | Fabian Schwingenschlögl | Germany | 56.29 | |
| 6 | 1 | Qin Haiyang | China | 56.77 | |
| 7 | 7 | Yan Zibei | China | 56.86 | |
| 8 | 8 | Berkay Ömer Öğretir | Turkey | 57.17 | |