By Madeline Folsom 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 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7 Finals: Day 1 | Day 2 | Day 3 | Day 4 | Day 5 | Day 6 | Day 7Well folks, this is it. We have made it to the final prelims session of the 2025 World Championships, and boy has it been an interesting one. In the last eight days we have seen upsets, and swimmers scratch events they were heavy favorites to win, and a few World Records, and the action is not done yet.
Today’s prelims session has some of the most anticipated events of the meet. The two best swimmers in the world right now, Leon Marchand and Summer McIntosh, will be taking the pool in the 400 IM, an event where their primary competition is the clock and the World Records they already own.
The meet will start with four heats of the men’s 200 IM and France’s Marchand will swim in heat four lane four as he attempts to earn his spot in the final this evening. His biggest competition, American Carson Foster, announced earlier that he would be scratching the event due to an ankle injury, and the 2nd seed Tomoyuki Matsushita will be swimming in the lane directly next to Marchand, seeded almost six seconds back.
The women’s 400 IM will have three heats, and did not have any major scratches. Summer McIntosh has the top seed by 10 seconds over the Americans seeded 2nd and 3rd. We have not seen Katie Grimes or Emma Weyant yet this week, so we are completely in the dark about how they have been impacted by the illness traveling around Team USA.
The meet will end with the prelims of the men’s and women’s 4×100 medley relays. As of the time of publishing, they have not announced the lineups for the relays, but whatever they are, it will be interesting. The men’s teams from Australia, China, The United States, and the NAB delegation have all missed a relay final at these championships, so they will all be attempting to prevent that from happening again.
The women’s relays are a little more straightforward, especially with American Torri Huske getting her feet back under her in the last few days in regard to the American illness. They are probably still the favorites, but they have to qualify for the final first, and as we have learned, that is not a sure thing.
This one will be fast, so take your bathroom breaks now if you want to see all the action.
Men’s 400 I.M. — Prelims
World Record: 4:02.50 – Leon Marchand, France (2023) World Junior Record: 4:10.02 – Ilya Borodin, Russia (2021) Championship Record: 4:02.50 – Leon Marchand, France (2023) 2023 World Champion: Leon Marchand (FRA) – 4:02.50 2024 Olympic Champion: Leon Marchand (FRA) – 4:02.95Top 8 Qualifiers
Tomoyuki Matsushita (JPN)- 4:10.39 Asaki Nishikawa (JPN)-4:10.41 Ilia Borodin (NAB)- 4:10.63 Max Litchfield (GBR)- 4:11.41 Maxim Stupin (NAB)- 4:11.53 Brendon Smith (AUS)- 4:13.08 Leon Marchand (FRA)- 4:13.19 Gabor Zombori (HUN)- 4:13.59Japan’s Tomoyuki Matsushita grabbed the top time of the morning in the men’s 400 IM, touching in 4:10.39 to just barely beat country mate Asaki Nishikawa’s 4:10.41 from the heat prior.
Matsushita was out in 2nd behind Leon Marchand after the first 200 meters, but he surged ahead on the breaststroke leg, splitting 1:11.55 to move into the lead, where he stayed for the freestyle leg to lock up lane four in tonight’s final.
In the 3rd heat, the first circle seeded heat, Japan’s Nishikawa got out to an early lead with Brendon Smith just behind him. Great Britain’s Max Litchfield and ilia Borodin from the NAB delegation began closing on the backstroke, and on the breaststroke leg, the whole field closed in on itself.
Borodin (29.73), Maxim Stupin (29.63), also from the NAB, and Litchfield (29.66) began closing on Nishikawa (30.42) on the first 50 of the freestyle, but Nisikawa came home in 27.76 to secure the event win by just two tenth over Borodin, who came home in 28.07.
Leon Marchand almost took it too easy in the prelims, shutting it down hard on the breaststroke and freestyle after leading through the first 200 mark. He finished 2nd in his heat, splitting 1:13.04 on the breaststroke and 1:01.77 (31.43/30.34) on the freestyle. He was the only swimmer in the top eight to split a 31 second 50 on one of the freestyle 50s.
Women’s 400 I.M. — Prelims
World Record: 4:23.65 – Summer McIntosh, Canada (2025) World Junior Record: 4:24.38 – Summer McIntosh, Canada (2024) Championship Record: 4:27.11 – Summer McIntosh, Canada (2023) 2023 World Champion: Summer McIntosh (CAN) – 4:27.11 2024 Olympic Champion: Summer McIntosh (CAN) – 4:27.71MEN’S 4×100 MEDLEY RELAY– Prelims
World Record: USA (R. Murphy, M. Andrew, C. Dressel, Z. Apple) — 3:26.78 (2021) World Championship Record: USA — 3:27.20 (2023) 2024 Olympic Champions: China (J. Xu, H.Qin, J. Sun, Z. Pan) — 3:27.46 2023 World Champions: USA (R. Murphy, N. Fink, D. Rose, J. Alexy) – 3:27.20Women’s 4×100 Medley Relay– Prelims
World Record: 3:49.63– United States (R. Smith, L. King, G. Walsh, T. Huske) (2024) World Junior Record: 3:58.38– Canada (T. Ruck, P. Oleksiak, R. Smith, K. Sanchez) (2017) World Championship Record: 3:50.40– United States (2019) 2023 World Champion: United States– 3:52.08 2024 Olympic Champion: United States– 3:49.63Read the full story on SwimSwam: 2025 World Championships: Day 8 Prelims Live Recap
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