Swimming at the 2025 World Aquatics Championships – Women's 100 metre butterfly

Women's 100 metre butterfly at the 2025 World Aquatics Championships
Venue	World Aquatics Championships Arena
Location	Singapore Sports Hub, Kallang
Dates	27 July (heats and semifinals) 28 July (final)
Competitors	58 from 53 nations
Winning time	54.73
Medalists
Gretchen Walsh    United States   Roos Vanotterdijk    Belgium   Alexandria Perkins    Australia
←  2024 2027  →

The women's 100 metre butterfly event at the 2025 World Aquatics Championships was held from 27 to 28 July 2025 at the World Aquatics Championships Arena at the Singapore Sports Hub in Kallang, Singapore. ^{[1] [2]}

Background

Gretchen Walsh of the United States was the front-runner in the event. She had set a world record of 54.60 seconds in 2025 and had also swum 54.76 at the 2025 United States Nationals, giving her the seven fastest swims in history and a 1.82-second lead over the second fastest swimmer in 2025. The US's Torri Huske (55.52 best, 56.59 in 2025), won the event at the 2024 Olympics, where she overtook Walsh in the final part of the race. ^[3]

Germany’s Angelina Köhler, Australia’s Alexandria Perkins (both 56.42), and China’s Zhang Yufei (57.39) were also in contention for medals. Likely finalists included Japan’s Mizuki Hirai, Sweden’s Louise Hansson, Belgium’s Roos Vanotterdijk, the Netherlands’ Tessa Giele, and Japan’s Rikako Ikee. ^[3]

Qualification

Further information: Swimming at the 2025 World Aquatics Championships § Qualification

Each National Federation was permitted to enter a maximum of two qualified athletes in each individual event, but they could do so only if both of them had attained the "A" standard qualification time. For this event, the "A" standard qualification time was 58.33 seconds. Federations could enter one athlete into the event if they met the "B" standard qualification time. For this event, the "B" standard qualification time was 1:00.37. Athletes could also enter the event if they had met an "A" or "B" standard in a different event and their Federation had not entered anyone else. Additional considerations applied to Federations who had few swimmers enter through the standard qualification times. Federations in this category could at least enter two men and two women to the competition, all of whom could enter into up to two events. ^{[4] [5]}

Top 10 fastest qualification times ^[6]

Swimmer	Country	Time	Competition
Gretchen Walsh	United States	54.60	Fort Lauderdale stop of the 2025 TYR Pro Swim Series
Torri Huske	United States	55.52	2024 United States Olympic Trials
Regan Smith	United States	55.62	2024 United States Olympic Trials
Zhang Yufei	China	56.15	2024 Summer Olympics
Angelina Köhler	Germany	56.33	2025 Berlin Swim Open
Alexandra Perkins	Australia	56.42	2025 Australian Trials
Maggie Mac Neil	Canada	56.44	2024 Summer Olympics
Emma McKeon	Australia	56.58	2024 Australian Championships
Mizuki Hirai	Japan	56.71	2024 Summer Olympics
Brianna Throssell	Australia	56.77	2024 Australian Championships

Records

Prior to the competition, the existing world and championship records were as follows. ^[7]

World record	Gretchen Walsh  (USA)	54.60	Fort Lauderdale, United States	3 May 2025
Competition record	Sarah Sjöström  (SWE)	55.53	Budapest, Hungary	24 July 2017

The following new records were set during this competition.

Date	Event	Name	Nationality	Time	Record
28 July	Final	Gretchen Walsh	United States	54.73	CR

Heats

The heats took place on 27 July at 10:51. ^{[8] [9]} Shortly before the heats, USA Swimming announced that Torri Huske had withdrawn from the event to focus on the 4 × 100 metre freestyle relay. The US's Gretchen Walsh swam the fastest qualifying time of 55.68, ahead of Germany's Angelina Köhler and Belgium's Roos Vanotterdijk who swam the second and third fastest times of 56.49 and 56.66, respectively. 2024 Olympic finalist Louise Hansson of Sweden did not qualify. ^[10]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	6	4	Gretchen Walsh	United States	55.68	Q
2	6	5	Angelina Köhler	Germany	56.49	Q
3	6	6	Roos Vanotterdijk	Belgium	56.66	Q, NR
4	4	5	Mizuki Hirai	Japan	56.81	Q
5	6	3	Yu Yiting	China	56.83	Q
6	5	5	Alexandria Perkins	Australia	56.89	Q
7	4	4	Zhang Yufei	China	57.11	Q
8	5	2	Daria Klepikova	Neutral Athlete B	57.29	Q
9	6	2	Erin Gallagher	South Africa	57.48	Q
10	5	6	Tessa Giele	Netherlands	57.56	Q
11	6	7	Lily Price	Australia	57.61	Q
12	4	6	Anna Ntountounaki	Greece	57.62	Q
13	4	3	Rikako Ikee	Japan	57.75	Q
14	4	7	Keanna Macinnes	Great Britain	57.90	Q
15	6	8	Helena Rosendahl Bach	Denmark	58.15	Q
16	5	7	Costanza Cocconcelli	Italy	58.31	Q
17	6	0	Arielle Hayon	Israel	58.35
18	5	1	Sara Junevik	Sweden	58.46
19	4	1	Anastasiya Kuliashova	Neutral Athlete A	58.52
19	6	1	Lilou Ressencourt	France	58.52
21	4	2	Georgia Damasioti	Greece	58.60
22	5	3	Louise Hansson	Sweden	58.64
23	5	8	Iris Julia Berger	Austria	58.91
24	4	8	Amina Kajtaz Pinjo	Croatia	59.18
24	4	9	Quah Jing Wen	Singapore	59.18
26	3	4	Brooklyn Douthwright	Canada	59.25
27	3	5	Zuzanna Famulok	Poland	59.28
28	4	0	Stephanie Balduccini	Brazil	59.72
29	6	9	Kim Do-yeon	South Korea	59.78
30	3	6	Miranda Grana	Mexico	59.86
31	5	9	Barbora Janíčková	Czech Republic	59.97
32	3	7	Lismar Lyon	Venezuela	1:00.19
33	5	0	Yeung Hoi Ching	Hong Kong	1:00.31
34	3	1	Liu Pei-yin	Chinese Taipei	1:00.90
35	3	3	Napatsawan Jaritkla	Thailand	1:01.00
36	3	0	Alexia Sotomayor	Peru	1:01.38
37	2	3	Emma Sabando	Ecuador	1:01.60
38	3	8	Jessica Calderbank	Jamaica	1:01.62
39	2	5	Imara Thorpe	Kenya	1:01.64
40	3	9	Varsenik Manucharyan	Armenia	1:01.68
41	2	4	Jóhanna Elín Guðmundsdóttir	Iceland	1:01.70
42	2	6	Anje Van As	Zimbabwe	1:02.63
43	3	2	Sofia Spodarenko	Kazakhstan	1:02.88
44	2	8	Ashley Calderon	Honduras	1:03.45
44	2	1	María Schutzmeier	Nicaragua	1:03.45
46	2	2	Lia Lima	Angola	1:03.86
47	1	5	Davia Richardson	Belize	1:04.29
48	2	7	Paige Schendelaar-Kemp	Samoa	1:05.21
49	1	0	Mia Laban	Cook Islands	1:05.41
50	1	4	Cheang Weng Chi	Macau	1:05.42
51	2	0	Asma Lefalher	Bahrain	1:05.53	NR
52	2	9	Aleka Persaud	Guyana	1:06.49
53	1	3	Amaya Bollinger	Guam	1:06.93
54	1	1	Honey Nan	Myanmar	1:09.89
55	1	7	Naekeisha Louis	Saint Lucia	1:12.38
56	1	8	Ony Andrianaivo	Madagascar	1:13.31
57	1	6	Amazya Macrooy	Suriname	1:14.69
58	1	2	Meral Latheef	Maldives	1:16.73
	5	4	Torri Huske	United States	Did not start

Semifinals

The semifinals took place on 27 July at 19:13. ^{[11] [9]} Russia's Daria Klepikova, representing the Neutral Athletes B team in this competition, swam 56.42 to break her country's national record. ^[12]

Rank	Heat	Lane	Name	Nationality	Time	Notes
1	2	4	Gretchen Walsh	United States	56.07	Q
1	2	5	Roos Vanotterdijk	Belgium	56.07	Q, NR
3	1	3	Alexandria Perkins	Australia	56.19	Q
4	1	6	Daria Klepikova	Neutral Athlete B	56.42	Q, NR [12] [note 1]
5	1	4	Angelina Köhler	Germany	56.75	Q
6	2	6	Zhang Yufei	China	56.84	Q
7	1	5	Mizuki Hirai	Japan	56.86	Q
8	2	3	Yu Yiting	China	57.11	Q
9	1	2	Tessa Giele	Netherlands	57.17
10	1	7	Anna Ntountounaki	Greece	57.32
11	2	7	Lily Price	Australia	57.58
12	1	1	Keanna Macinnes	Great Britain	57.67
13	2	2	Erin Gallagher	South Africa	57.68
14	2	1	Rikako Ikee	Japan	57.89
15	1	8	Costanza Cocconcelli	Italy	57.94
16	2	8	Helena Rosendahl Bach	Denmark	57.98

Final

The final took place on 28 July on 19:10. ^{[9] [13]}

Rank	Lane	Name	Nationality	Time	Notes
	4	Gretchen Walsh	United States	54.73	CR
	5	Roos Vanotterdijk	Belgium	55.84	NR
	3	Alexandria Perkins	Australia	56.33
4	7	Zhang Yufei	China	56.47
5	6	Daria Klepikova	Neutral Athlete B	56.53
6	2	Angelina Köhler	Germany	56.57
7	1	Mizuki Hirai	Japan	56.83
8	8	Yu Yiting	China	57.36

Notes

1. National record for Russia, through she was representing the Neutral Athletes B team.

References

1. "World Aquatics Championships – Singapore 2025". worldaquatics-singapore2025.com. Retrieved 5 July 2025.
2. "Start list" (PDF). omegatiming.com. Retrieved 26 July 2025.
3. Blacker, Sam (20 July 2025). "2025 World Championship Previews: Walsh Alone On The Mountaintop In Women's 100 Fly". SwimSwam. Retrieved 21 July 2025.
4. "Standard Entry Times" (PDF). World Aquatics . Retrieved 6 July 2025.
5. "Competition Regulations" (PDF). World Aquatics . pp. 13–14. Retrieved 6 July 2025.
6. "Qualifying | World Aquatics Official". World Aquatics. Retrieved 8 July 2025.
7. "Records book" (PDF). omegatiming.com. 26 July 2025.
8. "Heats results" (PDF). omegatiming.com. 27 July 2025.
9. "Competition Schedule | World Aquatics Official". World Aquatics. Retrieved 6 July 2025.
10. Pelshaw, Anya (27 July 2025). "Olympic Gold Medalist Torri Huske Out Of 100 Fly, Focusing On 4x100 Free Relay". SwimSwam. Retrieved 6 August 2025.
11. "Semifinals results" (PDF). omegatiming.com. 27 July 2025.
12. Kaufman, Sophie (27 July 2025). "2025 Worlds, Euro Recap: Lukas Märtens Earns 1st World Title, Completing Epic Year In 400 Free". SwimSwam. Retrieved 20 August 2025.
13. "Final results" (PDF). omegatiming.com. 28 July 2025.