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

The Women's 100 metre breaststroke competition at the 2019 World Championships was held on 22 and 23 July 2019.

## Records

Prior to the competition, the existing world and championship records were as follows.
| World record | Lilly King (USA) | 1:04.13 | Budapest, Hungary | 25 July 2017 |
| Competition record | Lilly King (USA) | 1:04.13 | Budapest, Hungary | 25 July 2017 |

## Results
### Heats

The heats were held on 22 July at 10:38.
| Rank | Heat | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | 4 | Lilly King | United States | 1:06.31 | Q |
| 2 | 6 | 4 | Yuliya Yefimova | Russia | 1:06.58 | Q |
| 3 | 6 | 2 | Martina Carraro | Italy | 1:06.62 | Q |
| 4 | 6 | 3 | Tatjana Schoenmaker | South Africa | 1:06.76 | Q |
| 5 | 4 | 4 | Reona Aoki | Japan | 1:06.81 | Q |
| 6 | 5 | 2 | Yu Jingyao | China | 1:06.91 | Q |
| 7 | 5 | 3 | Arianna Castiglioni | Italy | 1:07.09 | Q |
| 8 | 5 | 6 | Alia Atkinson | Jamaica | 1:07.25 | Q |
| 9 | 6 | 8 | Fanny Lecluyse | Belgium | 1:07.27 | Q, NR |
| 10 | 6 | 7 | Lisa Mamie | Switzerland | 1:07.30 | Q, NR |
| 11 | 6 | 6 | Jessica Vall | Spain | 1:07.32 | Q |
| 12 | 6 | 5 | Jessica Hansen | Australia | 1:07.38 | Q |
| 13 | 4 | 7 | Molly Renshaw | Great Britain | 1:07.43 | Q |
| 14 | 4 | 5 | Anna Belousova | Russia | 1:07.56 | Q |
| 15 | 4 | 1 | Alina Zmushka | Belarus | 1:07.69 | Q |
| 16 | 5 | 5 | Micah Sumrall | United States | 1:07.81 | Q |
| 17 | 4 | 6 | Tes Schouten | Netherlands | 1:08.01 | |
| 18 | 4 | 3 | Kierra Smith | Canada | 1:08.05 | |
| 19 | 4 | 8 | Ida Hulkko | Finland | 1:08.34 | |
| 20 | 5 | 7 | Sophie Hansson | Sweden | 1:08.39 | |
| 21 | 5 | 9 | Back Su-yeon | South Korea | 1:08.52 | |
| 22 | 5 | 8 | Kotryna Teterevkova | Lithuania | 1:08.64 | |
| 22 | 6 | 0 | Anna Sztankovics | Hungary | 1:08.64 | |
| 24 | 6 | 1 | Yeung Jamie Zhen Mei | Hong Kong | 1:08.70 | |
| 24 | 6 | 9 | Anna Elendt | Germany | 1:08.70 | |
| 26 | 3 | 5 | Maria Romanjuk | Estonia | 1:08.95 | |
| 27 | 3 | 4 | Phee Jinq En | Malaysia | 1:09.05 | |
| 27 | 3 | 6 | Viktoriya Zeynep Güneş | Turkey | 1:09.05 | |
| 29 | 4 | 0 | Matilde Schroder | Denmark | 1:09.62 | |
| 30 | 5 | 0 | Weronika Hallmann | Poland | 1:09.72 | |
| 31 | 4 | 2 | Shi Jinglin | China | 1:09.88 | |
| 32 | 3 | 0 | Ema Rajić | Croatia | 1:10.10 | |
| 33 | 3 | 3 | Tatiana Chișca | Moldova | 1:10.16 | |
| 33 | 5 | 1 | Niamh Coyne | Ireland | 1:10.16 | |
| 35 | 3 | 1 | Margaret Higgs | Bahamas | 1:10.65 | |
| 36 | 4 | 9 | Lin Pei-wun | Chinese Taipei | 1:10.74 | |
| 37 | 2 | 4 | Nàdia Tudó Cubells | Andorra | 1:11.53 | NR |
| 38 | 3 | 8 | María Jiménez Peon | Mexico | 1:11.83 | |
| 39 | 3 | 2 | Anandia Evato | Indonesia | 1:12.96 | |
| 40 | 3 | 7 | Adelaida Pchelintseva | Kazakhstan | 1:13.24 | |
| 41 | 2 | 2 | Lei On Kei | Macau | 1:14.11 | |
| 42 | 3 | 9 | Tilka Paljk | Zambia | 1:15.02 | |
| 43 | 2 | 6 | Maria Brunlehner | Kenya | 1:15.09 | |
| 44 | 1 | 3 | Jayla Pina | Cape Verde | 1:16.00 | |
| 45 | 2 | 8 | Tilali Scanlan | American Samoa | 1:16.03 | |
| 46 | 2 | 7 | Moana Wind | Fiji | 1:16.56 | |
| 47 | 1 | 2 | Darya Semyonova | Turkmenistan | 1:16.73 | |
| 48 | 2 | 5 | Amy Micallef | Malta | 1:17.06 | |
| 49 | 2 | 3 | Kirsten Fisher-Marsters | Cook Islands | 1:17.19 | |
| 50 | 1 | 6 | Chinelo Iyadi | Nigeria | 1:20.48 | |
| 51 | 1 | 7 | Evita Leter | Suriname | 1:20.89 | |
| 52 | 2 | 0 | Mishael Ayub | Pakistan | 1:22.76 | |
| 53 | 2 | 9 | Taeyanna Adams | Federated States of Micronesia | 1:26.13 | |
| 54 | 2 | 1 | Nooran Ba Matraf | Yemen | 1:26.30 | |
| 55 | 1 | 4 | Sajina Aishath | Maldives | 1:27.10 | NR |
| | 1 | 5 | Mariana Touré | Guinea | DNS | DNS |

### Semifinals

The semifinals were held on 22 July at 20:29.

#### Semifinal 1

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Yuliya Yefimova | Russia | 1:05.56 | Q |
| 2 | 5 | Tatjana Schoenmaker | South Africa | 1:06.61 | Q |
| 3 | 3 | Yu Jingyao | China | 1:06.85 | Q |
| 4 | 7 | Jessica Hansen | Australia | 1:06.98 | |
| 5 | 2 | Lisa Mamie | Switzerland | 1:07.11 | NR |
| 6 | 6 | Alia Atkinson | Jamaica | 1:07.11 | |
| 7 | 1 | Anna Belousova | Russia | 1:07.17 | |
| 8 | 8 | Micah Sumrall | United States | 1:07.94 | |

#### Semifinal 2

| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 4 | Lilly King | United States | 1:05.66 | Q |
| 2 | 3 | Reona Aoki | Japan | 1:06.30 | Q |
| 3 | 5 | Martina Carraro | Italy | 1:06.39 | Q, NR |
| 4 | 1 | Molly Renshaw | Great Britain | 1:06.73 | Q |
| 5 | 2 | Fanny Lecluyse | Belgium | 1:06.97 | QSO, NR |
| 6 | 6 | Arianna Castiglioni | Italy | 1:06.97 | QSO |
| 7 | 7 | Jessica Vall | Spain | 1:07.46 | |
| 8 | 8 | Alina Zmushka | Belarus | 1:07.69 | |

### Swim-off

The swim-off was held on 22 July at 21:31.
| Rank | Lane | Name | Nationality | Time | Notes |
| 1 | 5 | Arianna Castiglioni | Italy | 1:06.39 | Q, =NR |
| 2 | 4 | Fanny Lecluyse | Belgium | 1:07.22 | |

### Final

The final was held on 23 July at 21:47.
| Rank | Lane | Name | Nationality | Time | Notes |
| | 5 | Lilly King | United States | 1:04.93 | |
| | 4 | Yuliya Yefimova | Russia | 1:05.49 | |
| | 6 | Martina Carraro | Italy | 1:06.36 | NR |
| 4 | 3 | Reona Aoki | Japan | 1:06.40 | |
| 5 | 1 | Yu Jingyao | China | 1:06.56 | |
| 6 | 2 | Tatjana Schoenmaker | South Africa | 1:06.60 | |
| 7 | 7 | Molly Renshaw | Great Britain | 1:06.96 | |
| 8 | 8 | Arianna Castiglioni | Italy | 1:07.06 | |