# Swimming at the 2024 Summer Olympics – Women's 100 metre butterfly

The women's 100 metre butterfly event at the 2024 Summer Olympics was held from 27 to 28 July 2024 at Paris La Défense Arena, which was converted to a swimming pool for the swimming events. Since an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.
Going into the competition, Gretchen Walsh of the USA was the favourite, having set the event's world record at the Olympic Trials. Also among the favourites were China's Zhang Yufei and USA's Torri Huske, while Canada's Maggie Mac Neil was the defending champion. In the semifinals, Walsh set a new Olympic record, but in the finals Huske won by 0.04 seconds after coming back from over half a second behind over the last 35 metres. Walsh finished second and Yufei finished third. Swimming World called Huske's win a "stunning victory", and it was the first time the USA had won gold and silver in the event since 1984.
Two national records were set during the event: Barbora Seemanová broke the Czech Republic's record in the heats, and Roos Vanotterdijk broke Belgium's in the semifinals.

## Background

Canada's Maggie Mac Neil was the defending champion going into the event, and six of the finalists (including Mac Neil) from the previous Olympics were returning. Gretchen Walsh set a world record in the event at the 2024 US Olympic Trials, where Torri Huske had swum 0.21 seconds slower to claim the second qualification spot for the USA. Huske also won gold at the 2022 World Championships, while China's Zhang Yufei—who also qualified for this event—won gold at the 2023 World Championships. Both SwimSwam and Swimming World predicted that Gretchen Walsh was most likely to win the race.

## Qualification

Each National Olympic Committee (NOC) was permitted to enter a maximum of two qualified athletes in each individual event, but only if both of them had attained the Olympic Qualifying Time (OQT). For this event, the OQT was 57.92 seconds. World Aquatics then considered athletes qualifying through universality; NOCs were given one event entry for each gender, which could be used by any athlete regardless of qualification time, providing the spaces had not already been taken by athletes from that nation who had achieved the OQT. Finally, the rest of the spaces were filled by athletes who had met the Olympic Consideration Time (OCT), which was 58.21 for this event. In total, 40 athletes qualified through achieving the OQT, 35 athletes qualified through universality places and two athletes qualified through achieving the OCT.
Top 10 fastest qualification times :
| Swimmer | Country | Time | Competition |
| Gretchen Walsh | United States | 55:18 | 2024 United States Olympic Trials |
| Torri Huske | United States | 55:52 | 2024 United States Olympic Trials |
| Zhang Yufei | China | 55:86 | 2022 Asian Games |
| Angelina Köhler | Germany | 56:11 | 2024 World Aquatics Championships |
| Maggie Mac Neil | Canada | 56:45 | 2023 World Aquatics Championships |
| Emma McKeon | Australia | 56:58 | 2024 Australian Championships |
| Yu Yiting | China | 56:82 | 2024 Chinese Championships |
| Mizuki Hirai | Japan | 56:91 | 2024 Japanese Olympic Trials |
| Louise Hansson | Sweden | 56:94 | 2024 World Aquatics Championships |
| Lana Pudar | Bosnia and Herzegovina | 56:95 | 2023 European Junior Championships |

## Heats

Four heats took place on 27 July 2024, starting at 11:00. The swimmers with the best 16 times in the heats advanced to the semifinals. Yufei qualified fastest, swimming 56.50 seconds, while Barbora Seemanová lowered her national record for the Czech Republic by swimming 57.50—0.25 faster than her previous national record from the year prior.
Results :
| Rank | Heat | Lane | Swimmer | Nation | Time | Notes |
| 1 | 2 | 4 | Zhang Yufei | China | 56.50 | Q |
| 2 | 4 | 3 | Mizuki Hirai | Japan | 56.71 | Q |
| 3 | 3 | 4 | Torri Huske | United States | 56.72 | Q |
| 4 | 4 | 4 | Gretchen Walsh | United States | 56.75 | Q |
| 5 | 2 | 5 | Emma McKeon | Australia | 56.79 | Q |
| 6 | 4 | 5 | Angelina Köhler | Germany | 56.90 | Q |
| 7 | 3 | 5 | Maggie Mac Neil | Canada | 57.00 | Q |
| 8 | 3 | 6 | Alexandria Perkins | Australia | 57.46 | Q |
| 9 | 4 | 1 | Barbora Seemanová | Czech Republic | 57.50 | Q, NR |
| 10 | 2 | 6 | Marie Wattel | France | 57.54 | Q |
| 10 | 4 | 7 | Roos Vanotterdijk | Belgium | 57.54 | Q |
| 12 | 3 | 3 | Louise Hansson | Sweden | 57.57 | Q |
| 13 | 4 | 2 | Erin Gallagher | South Africa | 57.80 | Q |
| 14 | 4 | 6 | Rikako Ikee | Japan | 57.82 | Q |
| 15 | 3 | 2 | Tessa Giele | Netherlands | 57.89 | Q |
| 16 | 3 | 8 | Keanna Macinnes | Great Britain | 57.90 | Q |
| 17 | 2 | 3 | Lana Pudar | Bosnia and Herzegovina | 57.97 | |
| 18 | 2 | 2 | Hazel Ouwehand | New Zealand | 58.03 | |
| 19 | 3 | 7 | Anna Ntountounaki | Greece | 58.14 | |
| 20 | 1 | 4 | Helena Rosendahl Bach | Denmark | 58.45 | |
| 21 | 3 | 1 | Costanza Cocconcelli | Italy | 58.66 | |
| 22 | 2 | 8 | Ellen Walshe | Ireland | 58.70 | |
| 23 | 2 | 7 | Georgia Damasioti | Greece | 58.72 | |
| 24 | 4 | 8 | Rebecca Smith | Canada | 58.85 | |
| 25 | 1 | 5 | Laura Cabanes | Spain | 59.40 | |
| 26 | 1 | 6 | Varsenik Manucharyan | Armenia | 1:01.24 | |
| 27 | 1 | 2 | Oumy Diop | Senegal | 1:02.24 | |
| 28 | 1 | 1 | Ana Nizharadze | Georgia | 1:02.85 | |
| 29 | 1 | 3 | Luana Alonso | Paraguay | 1:03.09 | |
| 30 | 1 | 7 | María Schutzmeier | Nicaragua | 1:03.18 | |
| 31 | 1 | 8 | Hayley Hoy | Eswatini | 1:08.36 | |
| | 2 | 1 | Viola Scotto Di Carlo | Italy | DSQ | |

### Semifinals

Two semifinals took place on 27 July, starting at 20:30. The swimmers with the best 8 times in the semifinals advanced to the final. Walsh qualified with an Olympic Record of 55.38 seconds, which broke Sarah Sjöström's record from 2016 by 0.10. Huske qualified in second, and Yufei in third. Roos Vanotterdijk broke the Belgian national record, by swimming 57.25 seconds. This was 0.22 seconds faster than her previous national record set the month prior but was not enough to qualify.
Results :
| Rank | Heat | Lane | Swimmer | Nation | Time | Notes |
| 1 | 1 | 5 | Gretchen Walsh | United States | 55.38 | Q, OR |
| 2 | 2 | 5 | Torri Huske | United States | 56.00 | Q |
| 3 | 2 | 4 | Zhang Yufei | China | 56.15 | Q |
| 4 | 1 | 3 | Angelina Köhler | Germany | 56.55 | Q |
| 4 | 2 | 6 | Maggie Mac Neil | Canada | 56.55 | Q |
| 6 | 2 | 3 | Emma McKeon | Australia | 56.74 | Q |
| 7 | 1 | 4 | Mizuki Hirai | Japan | 56.80 | Q |
| 8 | 1 | 7 | Louise Hansson | Sweden | 56.93 | Q |
| 9 | 1 | 2 | Marie Wattel | France | 57.24 | |
| 10 | 2 | 7 | Roos Vanotterdijk | Belgium | 57.25 | NR |
| 11 | 2 | 2 | Barbora Seemanová | Czech Republic | 57.64 | |
| 12 | 1 | 1 | Rikako Ikee | Japan | 57.79 | |
| 13 | 1 | 6 | Alexandria Perkins | Australia | 57.84 | |
| 14 | 2 | 1 | Erin Gallagher | South Africa | 57.90 | |
| 15 | 2 | 8 | Tessa Giele | Netherlands | 57.91 | |
| 16 | 1 | 8 | Keanna Macinnes | Great Britain | 58.11 | |

### Final

The final took place at 20:40 on 28 July. Torri Huske started with the fastest reaction time of 0.63 seconds, but by 15 metres Gretchen Walsh had taken first place with a faster dive and underwater. By 25 metres, Zhang Yufei had taken the lead, but by 45 metres Walsh was back in front. At 65 metres (after the second turn and underwater) Walsh was over half a second ahead, having swum a 8.10 50–65 metre split, which was 0.5 seconds faster than anyone else in the race. Over the last 35 metres, Huske came from 0.69 behind to win by 0.04 seconds, pushing Walsh to second and Yufei to third. Matt Nelson, a journalist reporting on olympics.com, called the win a "stunning victory", while David Rieder of Swimming World said "it was a result three years in the making." It was the first time the USA had won gold and silver in the event since 1984, and it was Walsh's first Olympic medal.
Results :
| Rank | Lane | Swimmer | Nation | Time |
| | 5 | Torri Huske | United States | 55.59 |
| | 4 | Gretchen Walsh | United States | 55.63 |
| | 3 | Zhang Yufei | China | 56.21 |
| 4 | 6 | Angelina Köhler | Germany | 56.42 |
| 5 | 2 | Maggie Mac Neil | Canada | 56.44 |
| 6 | 7 | Emma McKeon | Australia | 56.93 |
| 7 | 1 | Mizuki Hirai | Japan | 57.19 |
| 8 | 8 | Louise Hansson | Sweden | 57.34 |
Statistics :
| Name | 15 metre split (s) | 50 metre split (s) | 50–65 metre split (s) | Time (s) | Stroke rate (strokes/min) |
| Torri Huske | 6.01 | 25.61 | 8.58 | 55.59 | 57.7 |
| Gretchen Walsh | 5.83 | 25.40 | 8.10 | 55.63 | 55.1 |
| Zhang Yufei | 5.95 | 25.42 | 8.65 | 56.21 | 61.9 |
| Angelina Köhler | 6.22 | 26.35 | 8.84 | 56.42 | 56.5 |
| Maggie Mac Neil | 6.27 | 25.94 | 8.43 | 56.44 | 61.0 |
| Emma McKeon | 6.17 | 26.40 | 8.69 | 56.93 | 54.3 |
| Mizuki Hirai | 6.45 | 26.66 | 8.51 | 57.19 | 59.8 |
| Louise Hansson | 6.18 | 26.61 | 8.61 | 57.34 | 56.4 |