By Sean Griffin on SwimSwam
2025 World Championships
July 27 – August 3, 2025 (pool swimming) Singapore, Singapore World Aquatics Championships Arena LCM (50m) Meet Central How To Watch SwimSwam Preview Index Entry Book Live Results Live Recaps Prelims: Day 1 Finals: Day 1Day One of swimming at the 2025 World Championships delivered a mix of highs and lows, with medals awarded in the men’s 400 freestyle, women’s 400 freestyle, men’s 4×100 freestyle relay, and women’s 4×100 freestyle relay.
SwimSwam has gathered the available race videos from each of the medal events, along with both semifinals of the women’s 200 IM. As of now, we have not been able to track down semifinal footage for the men’s 50 butterfly or 100 breaststroke. All videos are courtesy of NBC Sports, and Paul Griffin on X.
Men’s 400 Freestyle – Final
World Record: 3:39.96 – Lukas Märtens, Germany (2025) World Junior Record: 3:44.31 – Petar Mitsin, Bulgaria (2023) Championship Record: 3:40.07 – Paul Biedermann, Germany (2009) 2023 World Champion: Sam Short, Australia – 3:40.68 2024 Olympic Champion: Lukas Märtens, Germany – 3:41.78 Lukas Märtens (GER) – 3:42.35 Sam Short (AUS) – 3:42.37 Kim Woomin (KOR) – 3:42.60 Victor Johansson (SWE) – 3:44.68 Zhanshuo Zhang (CHN) – 3:44.82 Marco de Tullio (ITA) – 3:44.92 Peter Mitsin (BUL) – 3:45.28 Oliver Klemet (GER) – 3:46.86Sam Short and Lukas Martens were out ahead of the field, with the Australian flipping in 1:48.34 to lead the German in 1:48.53. Martens flipped the script in the third 100 to lead by two tenths as the began the final stretch, and the two were separated by just 0.06 seconds with 50 to go.
It was Martens who was able to close fastest, 28.03 to Short’s 28.11, as he took the win by just 0.02 seconds. This is the first world title in the event for the German swimmer, while Short returns to the podium after finishing 4th in Paris last summer.
Kim Woomin made it bronze for the second summer in a row, nearly gatecrashing the top two as he closed a second faster over the final 100. He ended up just two tenths back in 3:42.60, nearly matching his best time.
Victor Johansson set his second Swedish Record of the day to finish 4th in 3:44.68, holding off a fast finishing Zhanshuo Zhang, who broke 3:45 for the first time in 3:44.82.
WOMEN’S 100 BUTTERFLY – Semifinals
World Record: 54.60– Gretchen Walsh, USA (2025) World Junior Record: 56.33– Mizuki Hirai, JPN (2024) Championship Record: 55.53 – Sarah Sjostroem, SWE (2017) 2023 World Champion – Zhang Yufei (CHN), 56.12 2024 Olympic Champion – Torri Huske (USA), 55.59Top 8 Qualifiers:
Gretchen Walsh (USA) and Roos Vanotterdijk (BEL) – 56.07 – Alexandria Perkins (AUS) – 56.19 Daria Klepikova (NAB) – 56.42 Angelina Köhler (GER) – 56.75 Zhang Yufei (CHN) – 56.84 Mizuki Hirai (JPN) – 56.86 Yu Yiting (CHN) – 57.11Alexandria Perkins led out the first semi-final on a brand new PB on the day of her birthday, taking just over two-tenths of a second off to take the win in 56.19. She was just ahead of NAB’s Dari Klepikova, who broke 57 seconds for the first time and smash the Russian record by nearly seven-tenths of a second.
The second semifinal saw top seed Gretchen Walsh out in 25.76, half a second slower than she was this morning. She did not pull away from the field down the stretch, and instead it was Roos Vanotterdijk who closed fastest in 29.93 to pull even with the American and touch at exactly the same time in 56.07.
That was Vanotterdijk’s second Belgian record of the day, having cut nearly a second off her own mark from earlier this year in just a few hours.
Angelina Köhler and Zhang Yufei, the 2024 and 2023 World Champions, advanced in 5th and 6th place, respectively. Yu Yiting (57.11) completed the first part of her double tonight by sneaking into the final in 8th.
Great Britain’s Keanna Macinnes set a new personal best and Scottish record of 57.67, placing 12th overall.
Men’s 50 Fly – Semifinals
World Record: 22.27 – Andrii Govorov, Ukraine (2018) World Junior Record: 22.96 – Diogo Ribeiro, Portugal (2022) World Championships Record: 22.35 – Caeleb Dressel, United States (2019) 2023 World Champion: Thomas Ceccon, Italy (22.68)Top 8 Qualifiers:
Maxime Grousset (FRA) – 22.61 Noe Ponti (SUI) – 22.72 Ben Proud (GBR) – 22.74 Nyls Korstanje (NED) – 22.79 Diogo Ribeiro (POR) – 22.83 Thomas Ceccon (ITA) – 22.83 Gui Caribe (BRA) & Luca Armbruster (GER) – 22.91 –The Greek, Austrian, German, British, and French records all fell in the men’s 50 butterfly semifinals, with multiple 22-point swims failing to make the final.
26-year-old Maxime Grousset took the top seed in 22.61, clipping his previous French record of 22.70 set at last month’s French Elite Championships. He finished 0.11 seconds ahead of short course world record holder Noe Ponti, with 2017 world champion Ben Proud of Great Britain qualifying third.
Grousset, the 2023 world champion in the 100 fly, moves from 10th to 5th on the all-time performer list. He placed 9th in this event at the 2022 World Championships in Budapest (23.10), then rose to bronze in 2023 at 22.82. Now, he looks primed to challenge for gold tomorrow night, with Ponti shaping up to be his biggest threat.
Updated Top 10 Performer Rankings:
Andrii Govorov, Ukraine – 22.27 (2018) Caeleb Dressel, USA – 22.35 (2019) Rafael Munoz, Spain – 22.43 (2009) Nicholas Santos, Brazil – 22.60 (2023) Maxime Grousset, France — 22.70 (2025) *NEW* Oleg Kostin, Russia – 22.62 (2023) Noe Ponti, Switzerland – 22.65 (2024) Milorad Cavic, Serbia – 22.67 (2009) (TIE) Thomas Ceccon, Italy – 22.68 (2024) & Ilya Kharun, Canada — 22.68 (2025) N/APonti has been as fast as 22.65, set last year, so he’s within striking distance of that standard. He finished 13th at both the 2022 and 2023 World Championships, posting 23.29 in 2022 and 23.26 in 2023.
For Proud, his swim tonight marked his first personal best in the event since 2017, when he won the world title. That remains the only time the 50 freestyle specialist has medaled in the 50 fly, but that could change tomorrow. Regardless, it bodes well for his upcoming showdown in the 50 free with Cameron McEvoy later this week. At the Paris Olympics, Proud was narrowly out-touched by McEvoy, the reigning world champion, for gold by just 0.05 seconds.
The Netherlands’ Nyls Korstanje clocked 22.79 to move through to the final in fourth, just shy of his 22.72 national record from May. He’ll be aiming for his first individual Worlds medal after earning relay silver in 2024 and bronze in 2022. In this event, he placed 9th at the 2024 Worlds (23.25), 12th in 2023 (23.23), and 10th in 2022 (23.14).
World junior record holder and reigning world champion Diogo Ribeiro nearly matched his lifetime best of 22.80, touching in 22.83. Italy’s Thomas Ceccon, the 2023 world champion, also advanced safely in 22.83, just off his best of 22.68.
Seven of the eight finalists for tomorrow are European, with Brazil’s Gui Caribe the lone non-European in the field. Better known for his 50 and 100 free, Caribe dipped under his April career best of 22.95, hitting 22.91. He advanced in 7th, just ahead of Germany’s Luca Armbruster (22.91), who trimmed 0.01 off his national record from May.
The biggest miss came in 9th, as Canadian Ilya Kharun added slightly to his heats swim and finished just outside the final by one-hundredth, logging 22.92. Both Americans missed the cut, with Dare Rose placing 12th and Michael Andrew 16th. Neither swimmer broke the 23-second barrier, and both own a best time of 22.79.
Canadian Josh Liendo took more time off his personal best, notching 23.11, but did not advance and finished 13th.
Austria’s Simon Bucher (22.95) and Greece’s Stergios Marios Bilas (23.00) also missed the final, finishing 10th and 11th respectively. However, both broke their own national records. Bucher dropped exactly a tenth from the 23.05 he set at the 2023 Worlds, while Bilas edged under the 23.04 he posted earlier today in prelims.
WOMEN’S 400 FREESTYLE – Final
World Record: 3:54.18 – Summer McIntosh, Canada (2025) World Junior Record: 3:56.08– Summer McIntosh, Canada (2023) Championship Record: 3:55.38 – Ariarne Titmus, Australia (2023) 2023 World Champion – Ariarne Titmus (AUS), 3:55.38 2024 Olympic Champion – Ariarne Titmus (AUS), 3:57.49 Summer McIntosh (CAN) – 3:56.26 Li Bingjie (CHN) – 3:58.21 Katie Ledecky (USA) – 3:58.49 Lani Pallister (AUS) – 3:58.87 Isabel Gose (GER) – 4:02.90 Jamie Perkins (AUS) – 4:03.20 Yang Peiqi (CHN) – 4:06.47 Maya Werner (GER) – 4:09.38Lani Pallister went out with the two frontrunners through the first 150, as all three of her, McIntosh and Ledecky flipped in 1:57s. McIntosh began to pull away down the third 100 as Ledecky and Pallister settled into a fight for the silver.
McIntosh was nearly two seconds off World Record pace with 100 to go, as Li Bingjie seemed to close fastest as she caught a fading Pallister and swam past her in the final 50 meters. Not content with making up one place, she roared past Katie Ledecky in the final 10 meters to take silver as we had a remarkable four women under 3:59.
Bingjie ended up touching in 3:58.21 to take second, hacking nearly two seconds from her previous Chinese Record of 3:59.99, as she beat Ledecky by a quarter of a second. She came home in a staggering 58.27, including a 28.67 final 50.
Pallister was 3:58.87 to just miss the podium, as she made up half a second on Ledecky on the final length. She set a new best, and ranks as the 5th fastest women in history – she was unlucky that three of those faster were in the field tonight.
McIntosh ended up taking a comfortable win in 3:56.26, pulling away on the second half to take her first world title in the event, although she added two seconds from her World Record at Canadian Trials.
Men’s 100 Breast – Semifinals
World Record: 56.88 – Adam Peaty, Great Britain (2019) World Junior Record: 59.01 – Nicolo Martinenghi, Italy (2017) World Championships Record: 56.88 – Adam Peaty, Great Britain (2019) 2023 World Champion – Qin Haiyang (CHN) – 57.69 2024 Olympic Champion: 59.03 – Nicolo Martinenghi, ItalyTop 8 Qualifiers:
Qin Haiyang (CHN) – 58.24 Nicolo Martinenghi (ITA) – 58.62 Ludovico Viberti (ITA) – 58.89 Lucas Matzerath (GER) – 58.93 Josh Matheny (USA) – 59.15 Caspar Corbeau (NED) – 59.17 Denis Petrashov (KGZ) – 59.20 Kirill Prigoda (NAB) – 59.36Matzerath hit the wall first in semifinal 1, but it was Daniil Seminianov who looked the strongest with 25 to go. However, the German came through in a tight battle for the touch, swimming in the only time under 59 seconds. He was slightly slower than the 58.75 he went this morning,
Josh Matheny was second in a new best of 59.15, but fellow American Campbell McKean fell to 8th in his heat in 59.74. Caspar Corbeau was just off his new best from this morning as he made it through in 59.17
Denis Petrashov set another Kyrgyzstan record, his second of the season, as he finished in 59.20. He is only just over in Singapore after winning gold at the World University Games in Berlin last week
It was a pair of Italians who took charge for the second heat, with Ludivico Viberti hitting halfway first in 27.04. Viberti is the world leader in the 50 breast this season after a time fo 26.27 at the Sette Colli at the end of June, but did not make the Italian team in the event and will not swim it here in Singapore.
Qin Haiyang stormed home on the second 50 to touch in 58.24, his fastest time this year, to take lane 4 for tonight’s final. Viberti held on to go 58.89 for a new best time and take 3rd overall.
Nicolo Martinenghi, the Olympic Champion and second-fastest man tonight in 58.62, was sensationally disqualified before it was overturned on appeal. He will be in lane 5 tomorrow night
Kirill Prigoda, the top seed from this morning, added eight-tenths of a second and snuck through in 8th. Ilya Shymanovich and Melvin Imoudu, 58-point swimmers, missed the final.
Women’s 200 IM — Semifinals
World Record: 2:05.70 — Summer McIntosh, CAN (2025) World Junior Record: 2:06.56 — Summer McIntosh, CAN (2024) Championship Record: 2:06.12 — Katinka Hosszu, HUN (2015) 2023 World Champion: 2:07.17 — Kate Douglass, USA 2024 Olympic Champion: 2:06.56 — Summer McIntosh, CANTop 8 Qualifiers:
Summer McIntosh (CAN) – 2:07.39 Alex Walsh (USA) – 2:08.49 Mio Narita (JPN)- 2:09.16 Anastasia Gorbenko (ISR) – 2:09.68 Abbie Wood (GBR) – 2:10.12 Mary-Sophie Harvey – 2:10.19 Yu Zidi (CHN) – 2:10.22 Ellen Walshe (IRE) – 2:10.49Summer McIntosh absolutely dominated the first semifinal, touching in 2:07.39 as she blew the field away on the first 100, touching in 58.79 for the only sub-60 split of the night. Mary-Sophie Harvey came back strong for second, and ended up placing 6th overall in 2:10.19
Yu Yiting, on her second swim of the night, led out the second semi, but American Alex Walsh took over the lead by halfway. She pulled away from most of the field on the second half, but was matched by Anastasia Gorbenko, with Abbie Wood also separating herself from the field on the breaststroke.
Walsh touched first in 2:08.49 to take the win and secure the second seed for the final. Mio Narita closed the fastest, posting the only sub-31 final 50 with a 30.42 to finish in 2:09.16—a new personal best. Wood and Gorbenko also advanced, finishing 4th and 5th, respectively.
Yu Zidi, just 12 years old, swam a best time of 2:10.22 to qualify 7th, finishing ahead of her teammate Yu Yiting.
Tara Kinder, the top seed from this morning, placed last in her semifinal and missed the final after adding two seconds to finish 12th overall. Phoebe Bacon also added time from her season best and did not advance.
Ellen Walshe set a new Irish Record in 2:10.49, making it through to her first long course world final.
Semifinal #1:
Ellen Walshe's brilliant 200 IM Irish record 2:10.49 to finish third and make the final. pic.twitter.com/YxtJ0vCYkG
— Paul Griffin (@PGriffinFC) July 27, 2025
Semifinal #2:
Women’s 4×100 Free Relay – Final
World Record: 3:27.96 – AUS (M. O’Callaghan, S. Jack, M. Harris, E. McKeon), 2023 World Junior Record: 3:36.19 – CAN (T. Ruck, P. Oleksiak, R. Smith, K. Sanchez) – 2017 Championship Record: 3:27.96 – AUS (M. O’Callaghan, S. Jack, M. Harris, E. McKeon), 2023 2023 World Champion: AUS (M. O’Callaghan, S. Jack, M. Harris, E. McKeon) – 3:27.96 2024 Olympic Champion – AUS (M. O’Callaghan, S. Jack, E. McKeon, M. Harris) – 3:28.92 Australia – 3:30.60 USA – 3:31.04 Netherlands – 3:33.89 China – 3:34.17 France -3:34.62 NAB – 3:34.69 Italy – 3:35.18 Hungary – 3:36.34Milou van Wijk was out first to 50 meters, but it was Mollie O’Callaghan who touched first in 52.79, 0.71 seconds off her best. Simone Manuel was just behind in 53.09, dropping a significant amount of time from her 54.21 anchor this morning, as van Wijk was just behind in 53.27
Both Meg Harris (51.89) and Kate Douglass (51.92) broke 52 seconds on leg 2 as the U.S. and Australia separated themselves from the field.
After Gretchen Walsh was a sensational late withdrawal from this relay, her replacement Erin Gemmell split 53.17 on the third leg. Milla Jansen was 52.89 to pull Australia slightly ahead, handing over to anchor Olivia Wunsch.
Torri Huske erased the Australian’s lead down the first 50 of the final leg, but could not hold off Olivia Wunsch in the closing meters. The Australian swimmer powered past in the final 15 of the race, coming home in 27.51 to give Australia the win.
Huske split 52.88, but did all the work on the first 50 meters, going out in 24.75.
The Netherlands took bronze after several years off the podium, as Marrit Steenbergen came home like a train in 51.64. That was the fastest split in the field, as she outtouched China’s Wu Qingfeng by 0.28 seconds.
France and NAB also got sub-53 anchors, with Marie Wattel (52.97) and Daria Klepikova (52.68) fighting it out for 5th, which was won by the Frenchwoman.
Men’s 4×100 Freestyle Relay – Final
World Record: 3:08.24 – United States (M. Phelps, G. Weber-Gale, C. Jones, J. Lezak) (2008) World Junior Record: 3:15.49 — United States (D. Diehl, M. Williamson, H. Williams, J. Zhao) (2023) World Championship Record: 3:09.06 — United States (C. Dressel, B. Pieroni, Z. Apple, N. Adrian) (2019) 2023 World Champion: Australia- 3:10.16 2024 Olympic Champion: United States- 3:09.28 Australia – 3:08.97 *Championship Record* Italy – 3:09.58 USA -3:09.64 Great Britain – 3:10.73 China -1 3:11.15 Hungary – 3:12.75 Lithuania – 3:12.84 Canada – 3:12.89Jack Alexy was out first to the 50 meter mark, touching in 22.36 to lead by nearly half a second. He handed over in 47.24, just off his best, as we had five teams go out under 48 seconds. Carlos D’Ambrosio reset his brand new best time to go 47.78 at just 17 years old. Flynn Southam was right on his best with a swim of 47.77.
We got a 47.03 split from Patrick Sammon on leg two, although that was matched almost exactly by Australia’s Kai Taylor (47.04). Italy’s Thomas Ceccon kept them in touch at halfway with a 47.10 leg of his own, but China, who had Pan Zhanle on the anchor, were well back.
Chris Giuliano and Max Giuliani matched each other as well on leg 3, with the American having the edge 47.43 to 47.63, but the fastest leg came from Italy’s Lorenzo Zazzeri in 47.36, and he took a quarter of a second off his split from this morning.
The final 100 was absolute vintage swimming. Italy, Australia and the U.S were separated by just 0.21 at the final turn, and when you have Kyle Chalmers hot on your heels with 50 to go you know that you’re in trouble. King Kyle split 46.53, one of only two sub-47 in the field, as Australia ended up winning by more than six-tenths of a second.
Jonny Kulow (47.94) faded in the final few meters and was overtaken by Italian anchor Manuel Frigo (47.34), as the U.S. broke 3:10 and still only took bronze in what was the fastest podium in history.
Pan Zhanle was 46.63 on the anchor for China but was too far back to get in on the action, as Great Britain took 4th in a new National Record of 3:10.73. Matt Richards and Duncan Scott had 47-low splits for the Brits, who will be hoping for more relay success in the men’s 4×200 free later in the week.
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