2025 World Championships
- July 27 – August 3, 2025 (pool swimming)
- Singapore, Singapore
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Women’s 400 IM — Final
- 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) – 4:27.71
Final:
- Summer McIntosh (Canada) – 4:25.78 *Championship Record*
- Jenna Forrester (Australia)/Mio Narita (Japan) – 4:33.26
- (tie)
- Yu Zidi (China) – 4:33.76
- Emma Weyant (United States) – 4:34.01
- Katie Grimes (United States) – 4:36.52
- Waka Kobori (Japan) – 4:38.05
- Freya Colbert (Great Britain) – 4:40.21
Summer McIntosh won her fourth gold medal of the week on the final night, taking the 400 IM by more than seven seconds in a dominant swim that stacks up as the 3rd-fastest all-time. She was out fast, the only swimmer under 1:00 on the fly as she led by more than two seconds, and only ever increased that lead as she took the win by more than seven seconds over co-silver-medalists Mio Narita and Jenna Forrester.
This is McIntosh’s 4th gold medal of the meet and 5th in total, making her the most decorated individual female athlete at a single world championships. She has taken victories in the 400 free, 200 IM, 200 fly and 400 IM, along with bronze in the 800 free last night. Having stated that “I hate losing more than I like winning” after that bronze medal, she returned to the top step of the podium tonight.
Compared to her two fastest performances, McIntosh did not close quite as strong this time around. She was out right on her World Record pace from this year’s Canadian Trials through the first 200 meters, but her breaststroke split of 1:19.38 was slower than the 1:18.02 from her World Record or the 1:17.13 she swam in 2024.
| 2025 Canadian Trials (#1 all-time) | 2024 Canadian Trials (#2 all-time) | 2025 World Championships (#3 all-time) | |
| 50 | 27.75 | 27.55 | 27.47 |
| 100 | 59.18 (31.43) | 59.18 (31.63) | 59.31 (31.84) |
| 150 | 1.32.36 (33.18) | 1:33.31 (34.13) | 1:32.75 (33.44) |
| 200 | 2:05.31 (32.95) | 2:06.30 (32.99) | 2:05.49 (32.74) |
| 250 | 2:43.67 (38.36) | 2:44.22 (37.92) | 2:44.37 (38.88) |
| 300 | 3:23.33 (39.66) | 3:23.43 (39.21) | 3:24.77 (40.40) |
| 350 | 3:54.28 (30.95) | 3:54.66 (31.23) | 3:55.88 (31.11) |
| 400 | 4:23.65 (29.37) | 4:24.38 (29.72) | 4:25.78 (29.90) |
She still closed with a sub-30 final 50 on the freestyle despite being just a shade over 1:01, which she has now done in all three performances.
She now owns five of the top six performances in history. She also owns 11 of the 19 fastest swims, in an event she has dominated since first winning the world title in 2022.
Top 5 Performances All-Time, Women’s 400 IM
- Summer McIntosh, CAN (2025): 4:23.65
- Summer McIntosh, CAN (2025): 4:24.38
- Summer McIntosh, CAN (2025): 4:25.78
- Summer McIntosh, CAN (2023): 4:25.87
- Katinka Hosszu, HUN (2016): 4:26.36
- Summer McIntosh, CAN (2025): 4:26.98
Excellent race, Summer! Great way to finish a tremendous week. Impressive!
Nice to see the 2 silver medalists so happy.
Surprising to see where Emma W and Katie G placed.
Great swimming Summer just continue to have fun
Respectfully disagree. As a USA fan, I have a lot of respect for Summer. She congratulated Katie and Lannie after the 800 free. While clearly disappointed, she was honest and you get a sense of her passion, fire, and competitiveness. Her comment “I hate losing more than I love winning” is pure absolute gold. Instead of the usual blah, blah, blah, from athletes who don’t really reveal anything in an interview, with Summer you got a good window into the person-how she thinks and feels.
On top of that, she swims 3rd fastest 400IM on last day of meet after a brutally tough schedule.
Her interview after the 800 free was very honest. She is great for the… Read more »
Appreciate your comments and agree 100%.
I remember reading just 3 years ago about Mio setting the WJR at 4:36.71. Hard to believe that it’s now over 10 seconds faster and that a literal 12 year old has been 3 seconds faster than that old WJR
Her fastest swim outside of Canadian trials.
you guys are missing summer’s first 400 IM WR on the list where she went 4:25.87 if im not mistaken…. which means she owns the top 4.
Right you are, thanks!
Summer and Leon swimming exploits are so dynamite that 4:25 and 4:04 didn’t elicit much enthusiasm. Crazy.
Both had to swim the 4×100 medley relay afterwards so I think both conserved a little energy. As it was, they both said they were exhausted.
Not bad for swimming tired