By Anya Pelshaw on SwimSwam
2025 U.S. OPEN
December 3-6, 2025 Austin, Texas Lee and Joe Jamail Texas Swimming Center Prelims: 10 a.m. EST Finals: 7 p.m EST (Day 1: 5 p.m. EST) LCM (50 meters) Meet Central Psych Sheets Live Results Live Recaps Prelims: Day 2 Finals: Day 1 | Day 2Women’s 400 Freestyle – Finals
World Record: 3:54.18 – Summer McIntosh, Canada (2025) U.S. Open Record: 3:56.81 – Katie Ledecky, USA (2025) Meet Record: 3:59.42 – Summer McIntosh, 2023Top 8 Finishers
Summer McIntosh (TXLA) — 3:55.37 **U.S. Open Record Anna Peplowski (ISC) — 4:10.55 Emma Weyant (GSC) — 4:11.25 Mila Nikanorov (OSU) — 4:11.91 Chloe Stepanek (LIAC) — 4:15.36 Alex Siegel (LIAC) — 4:14.55 Erin Gemmell (TEX) — 4:16.54 Leticia Fassina Romao (UOFL) — 4:17.73Summer McIntosh swam to the #2 performance in the 400 free all-time with a 3:55.37 in her win tonight. That also broke Katie Ledecky‘s US Open Record of a 3:56.81 that Ledecky swam a the end of April at the Fort Lauderdale Pro Series stop. McIntosh also broke her own meet record from 2023 and was just over a second off her own World Record.
Split Comparison
Distance (m) Summer McIntosh New US Open Record Summer McIntosh World Record Katie Ledecky Old US Open Record 50 27.13 27.13 27.22 27.22 27.46 27.46 100 29.29 56.42 29.73 56.95 29.51 56.97 150 29.81 1:26.23 29.61 1:26.56 29.96 1:26.93 200 30.08 1:56.31 29.86 1:56.42 30.22 1:57.15 250 29.99 2:26.30 29.62 2:26.04 29.99 2:27.14 300 30.1 2:56.40 29.61 2:55.65 30.16 2:57.30 350 29.72 3:26.12 29.47 3:25.12 30.01 3:27.31 400 29.25 3:55.37 29.06 3:54.18 29.5 3:56.81The biggest difference between McIntosh today and Ledecky back in April was on the first and last 100s. McIntosh was already half a second under Ledecky’s old record and also half a second under her own World Record at the 100 mark. She remained under Ledecky’s record the remainder of the race but fell off pace of her World Record half way through the race.
With her swim today, McIntosh now holds four of the six fastest performances all-time.
All-Time Top Performances, Women’s LCM 400 Free
Summer McIntosh, 3:54.18 — 2025 Canadian Swimming Trials Summer McIntosh, 3:55.37 – 2025 US Open Ariarne Titmus, 3:55.38 — 2023 World Champs Ariarne Titmus, 3:55.44 — Australian Olympic & Paralympic Trials 2024 Summer McIntosh, 3:56.08 — Bell Canadian Swimming Trials 2023 Summer McIntosh, 3:56.26 — 2025 World ChampsToday’s swims for McIntosh were her first since the 2025 World Championships. McIntosh was originally scheduled to compete at the World Cup series in October but scratched due to illness.
Read the full story on SwimSwam: Summer McIntosh Breaks Ledecky’s US Open Record With 3:55.37 400 Free, #2 Swim All-Time
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