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

The men's 100 metre butterfly event at the 2024 Summer Olympics was held from 2 to 3 August 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.
Defending Olympic champion Caeleb Dressel of the USA was the favourite going into the event, while defending Olympic silver medallist Kristóf Milák of Hungary, Canada's Josh Liendo and France's Maxime Grousset were also favourites. In the semifinals, Dressel did qualify for the final, while Nyls Korstanje set a new Dutch record to qualify fourth. Milák won the final with a time of 49.90, 0.09 seconds ahead of Liendo who won silver with a new Canadian national record of 49.99. Canada's Ilya Kharun finished third with 50.45.

## Background

The defending Olympic champion, Caeleb Dressel of the USA; the defending Olympic silver medallist, Kristóf Milák of Hungary; and the defending Olympic bronze medallist, Noè Ponti of Switzerland, were returning. Dressel had missed a period of competition from 2022 to 2023, during which Milák won the event at the 2022 World Championships. However, he also took a break from swimming in 2023. Milák returned to training in 2024, but the Hungarian national head coach Csaba Sós reported that Milák had been training inconsistently in the lead up to the Olympics. In Dressel and Milák's absence, France's Maxime Grousset won the event at the 2023 World Championships.
Going into the event, Canada's Josh Liendo was ranked number one in the world, having swum a 50.06 at the Canadian Olympic Trials. Other contenders who had swum under 51 seconds in 2024 were: Hungarian Hubert Kós, Dutchman Nyls Korstanje, Katsuhiro Matsumoto of Japan, Jakub Majerski of Poland, Gal Cohen Groumi of Israel and Thomas Heilman of the USA. Both SwimSwam and Swimming World opined that Dressel would win gold and Liendo would take silver. Swimming World also said it was "one of the most anticipated races of the Paris Games".

## 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 51.67 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 51.93 for this event. In total, 29 athletes qualified through achieving the OQT, 10 athletes qualified through universality places and one athlete qualified through achieving the OCT.
Top 10 fastest qualification times :
| Swimmer | Country | Time | Competition |
| Josh Liendo | Canada | 00:50:06 | 2024 Canadian Olympic Trials |
| Maxime Grousset | France | 00:50:14 | 2023 World Aquatics Championships |
| Noè Ponti | Switzerland | 00:50:16 | 2024 Swiss Championships |
| Caeleb Dressel | United States | 00:50:19 | 2024 United States Olympic Trials |
| Matthew Temple | Australia | 00:50:25 | 2023 Japan Open |
| Kristóf Milák | Hungary | 00:50:75 | 2024 Mare Nostrum Monte Carlo |
| Nyls Korstanje | Netherlands | 00:50:78 | 2023 World Aquatics Championships |
| Thomas Heilman | United States | 00:50:80 | 2024 United States Olympic Trials |
| Hubert Kós | Hungary | 00:50:84 | 2024 Pro Swim Series San Antonio |
| Katsuhiro Matsumoto | Japan | 00:50:96 | 2023 Japanese Championships |

## Heats

Five heats took place on 2 August 2024, starting at 11:00. The swimmers with the best 16 times in the heats advanced to the semifinals. Milák swam the fastest, with a time of 50.19. Heilman did not qualify. Jesse Ssuubi Ssengonzi lowered his Ugandan record with a time of 53.76.
Results :
| Rank | Heat | Lane | Swimmer | Nation | Time | Notes |
| 1 | 3 | 5 | Kristóf Milák | Hungary | 50.19 | Q |
| 2 | 5 | 4 | Josh Liendo | Canada | 50.55 | Q |
| 3 | 3 | 4 | Noè Ponti | Switzerland | 50.65 | Q |
| 3 | 4 | 4 | Maxime Grousset | France | 50.65 | Q |
| 5 | 5 | 2 | Ilya Kharun | Canada | 50.71 | Q |
| 6 | 5 | 5 | Caeleb Dressel | United States | 50.83 | Q |
| 7 | 4 | 5 | Matthew Temple | Australia | 50.89 | Q |
| 8 | 5 | 3 | Nyls Korstanje | Netherlands | 51.17 | Q |
| 9 | 4 | 6 | Jakub Majerski | Poland | 51.18 | Q |
| 10 | 3 | 6 | Gal Cohen Groumi | Israel | 51.30 | Q |
| 11 | 5 | 1 | Ben Armbruster | Australia | 51.33 | Q |
| 12 | 5 | 6 | Katsuhiro Matsumoto | Japan | 51.43 | Q |
| 13 | 4 | 7 | Simon Bucher | Austria | 51.55 | Q |
| 14 | 3 | 3 | Hubert Kós | Hungary | 51.58 | Q |
| 15 | 4 | 1 | Naoki Mizunuma | Japan | 51.62 | Q |
| 15 | 5 | 7 | Clement Secchi | France | 51.62 | Q |
| 17 | 3 | 8 | Josif Miladinov | Bulgaria | 51.77 | |
| 18 | 4 | 3 | Thomas Heilman | United States | 51.82 | |
| 19 | 2 | 6 | Sun Jiajun | China | 51.85 | |
| 20 | 3 | 2 | Diogo Ribeiro | Portugal | 51.90 | |
| 21 | 4 | 2 | Tomer Frankel | Israel | 51.94 | |
| 22 | 4 | 8 | Kayky Mota | Brazil | 52.11 | |
| 23 | 5 | 8 | James Guy | Great Britain | 52.23 | |
| 24 | 2 | 5 | Chad le Clos | South Africa | 52.24 | |
| 25 | 2 | 4 | Mario Mollà | Spain | 52.27 | |
| 26 | 3 | 7 | Wang Changhao | China | 52.37 | |
| 27 | 3 | 1 | Daniel Gracik | Czech Republic | 52.61 | |
| 28 | 2 | 3 | Kaii Winkler | Germany | 52.64 | |
| 29 | 2 | 7 | Adilbek Mussin | Kazakhstan | 52.74 | |
| 30 | 1 | 2 | Nikola Miljenic | Croatia | 53.32 | |
| 31 | 1 | 3 | Jesse Ssuubi Ssengonzi | Uganda | 53.76 | |
| 32 | 2 | 1 | Cameron Gray | New Zealand | 53.83 | |
| 33 | 1 | 5 | Joe Kurniawan | Indonesia | 53.95 | |
| 34 | 1 | 4 | Milos Milenkovic | Montenegro | 54.26 | |
| 35 | 2 | 2 | Matthew Sates | South Africa | 54.53 | |
| 36 | 1 | 6 | Josh Kirlew | Jamaica | 54.66 | |
| 36 | 2 | 8 | Jarod Hatch | Philippines | 54.66 | |
| 38 | 1 | 7 | Oscar Cyusa Peyre Mitilla | Rwanda | 58.77 | |
| 39 | 1 | 1 | Hasan Ali Khaleel Al-Zinkee | Iraq | 1:00.23 | |
| 40 | 1 | 8 | Yusuf Marwan Abdullah Nasser | Yemen | 1:08.72 | |

## Semifinals

Two semifinals took place on 2 August, starting at 21:05. The swimmers with the best eight times in the semifinals advanced to the final. Milák claimed the fastest seed with at time of 50.38, and Grousset finished with 50.41 to take the second seed. Dressel did not make it through to the final with a time of 51.57, and was filmed crying after the race. SwimSwam speculated that is poor performance could have been due to having already swum three races that day, including the final of the 50 metre freestyle 30 minutes earlier. Nyls Korstanje set a new Dutch record of 50.59 to qualify fourth, which beat his previous national record of 50.78. None of the countries that qualified had previously won a gold medal in the event.
Results :
| Rank | Heat | Lane | Swimmer | Nation | Time | Notes |
| 1 | 2 | 4 | Kristóf Milák | Hungary | 50.38 | Q |
| 2 | 1 | 5 | Maxime Grousset | France | 50.41 | Q |
| 3 | 1 | 4 | Josh Liendo | Canada | 50.42 | Q |
| 4 | 1 | 6 | Nyls Korstanje | Netherlands | 50.59 | Q, NR |
| 5 | 2 | 5 | Noè Ponti | Switzerland | 50.60 | Q |
| 6 | 2 | 3 | Ilya Kharun | Canada | 50.68 | Q |
| 7 | 2 | 6 | Matthew Temple | Australia | 50.95 | Q |
| 8 | 2 | 8 | Naoki Mizunuma | Japan | 51.08 | Q |
| 9 | 2 | 7 | Ben Armbruster | Australia | 51.17 | |
| 10 | 2 | 1 | Simon Bucher | Austria | 51.35 | |
| 11 | 2 | 2 | Jakub Majerski | Poland | 51.37 | |
| 12 | 1 | 2 | Gal Cohen Groumi | Israel | 51.48 | |
| 13 | 1 | 3 | Caeleb Dressel | United States | 51.57 | |
| 14 | 1 | 8 | Clement Secchi | France | 51.58 | |
| 15 | 1 | 7 | Katsuhiro Matsumoto | Japan | 51.69 | |
| 16 | 1 | 1 | Hubert Kós | Hungary | 52.22 | |

## Final

The final took place at 20:30 on 3 August. Milák won with a time of 49.90; he was fifth at the halfway turn but finished with the fastest closing 50 metres split to win gold. Canada's Ilya Kharun had the second fastest closing 50 metres split, which elevated him from seventh at halfway to third at the finish, winning him the bronze. Grousset was third at the 50 metre mark, but performed a slow turn compared to the rest of the field which SwimSwam later opined may have cost him third place. Liendo was second at the 50 metre mark, but he performed a fast open turn and underwater to emerge in the lead. His finishing touch wasn't as well timed as Milák's, which SwimSwam said might have cost him the gold medal. He won silver with a new Canadian national record of 49.99. Karun was the only swimmer to increase his distance per stroke (DPS) throughout the race, while Milák had the highest average DPS.
Liendo's silver made him the fifth fastest performer of all time in the event and won him his first Olympic medal. Liendo and Kharun gave Canada its first double podium of the games since the 1976 Summer Olympics.
Results :
| Rank | Lane | Swimmer | Nation | Time | Notes |
| | 4 | Kristóf Milák | Hungary | 49.90 | |
| | 3 | Josh Liendo | Canada | 49.99 | NR |
| | 7 | Ilya Kharun | Canada | 50.45 | |
| 4 | 2 | Noè Ponti | Switzerland | 50.55 | |
| 5 | 5 | Maxime Grousset | France | 50.75 | |
| 6 | 6 | Nyls Korstanje | Netherlands | 50.83 | |
| 7 | 1 | Matthew Temple | Australia | 51.10 | |
| 8 | 8 | Naoki Mizunuma | Japan | 51.11 | |
Statistics :
| Name | 15 metre split (s) | 50 metre split (s) | 50–65 metre split (s) | Time (s) | Stroke rate (strokes/min) |
| Kristof Milak | 5.25 | 23.40 | 7.42 | 49.90 | 52.7 |
| Josh Liendo | 5.22 | 23.24 | 7.41 | 49.99 | 56.8 |
| Ilya Kharun | 5.48 | 23.73 | 7.40 | 50.45 | 58.7 |
| Noe Ponti | 5.36 | 23.70 | 7.21 | 50.55 | 56.7 |
| Maxime Grousset | 5.42 | 23.26 | 7.86 | 50.75 | 54.9 |
| Nyls Korstanje | 5.36 | 23.23 | 7.58 | 50.83 | 58.6 |
| Matthew Temple | 5.25 | 23.59 | 7.38 | 51.10 | 53.8 |
| Naoki Mizunuma | 5.70 | 24.03 | 7.62 | 51.11 | 58.0 |