Bold takeaway: Carson Foster just shattered the US Open meet record in the men’s 400 IM, clocking 4:07.02, his second-fastest swim ever. This performance showcases not only a new standard for the event at the Open but also a sign of Foster’s sustained elite form on the global stage.
But here’s where it gets controversial... Foster’s time sits just off his lifetime best from the World Championships, hinting at potential strategic pacing, training emphasis, or race-day conditions that still earned him a record-setting swim in Austin. And this is the part most people miss: even among record breakers, the margins matter. A quarter or half a second here or there can reflect small but meaningful differences in how each swimmer approaches the fly, back, and free segments.
Event snapshot: 2025 U.S. Open, December 3–6, in Austin, Texas at the Lee and Joe Jamail Texas Swimming Center. The schedule features prelims at 10 a.m. EST and finals at 7 p.m. EST (with a Day 1 early final option at 5 p.m., dependent on session structure). The competition is conducted in long course meters (LCM), with comprehensive meet materials available online, including meet central, psych sheets, live results, and live recap links.
Top finishers in the MEN’S 400 IM – Finals:
- Carson Foster (UN-MR) – 4:07.02 CR
- Luka Mijatovic (PLS) – 4:15.91
- Baylor Nelson (TEX) – 4:15.91
- Cooper Lucas (TEX) – 4:16.60
- Tommy Bried (UOFL) – 4:18.65
- Tristan Jankovics (OSU) – 4:19.02
- Bobby Finke (SPA-FL) – 4:19.02
- Gregg Enoch (UOFL) – 4:24.80
Context and comparison: Foster’s 4:07.02 not only sets a new U.S. Open meet record, but it also ranks as his second-fastest ever; his personal best remains 4:06.52, reached when he helped secure silver medals at the World Championships in 2022 and 2023. The prior U.S. Open record was 4:10.09, set by Chase Kalisz in 2022, which Foster surpassed.
Split analysis (highlights): Foster outpaced Kalisz on the fly, back, and free portions, while Kalisz showed strength on the breaststroke leg in 2022. The largest gap today was backstroke, where Foster wasn’t ahead of his 2022 mark by more than a fraction of a second in that segment. Overall, Foster’s splits indicate a strong, even-keeled race with a superior closing 400 compared to some past efforts.
Injury note and context: Foster did not compete in the 400 IM at the 2025 World Championships, withdrawing before finals of the 200 IM due to an ankle injury. Heading into Worlds, he was the No. 3 seed for the 400 IM, and the performance here would have yielded a silver medal by current standards.
What this means going forward: Foster’s 4:07.02 demonstrates that he remains among the world’s elite in the 400 IM, closing the year with a signature performance that City-level and national-level programs will study for training cues. It also raises questions about how to optimize all four strokes across the distance and how injuries influence taper plans and event selection at major championships.
Discussion prompts: Do you think Foster’s recovery from his ankle issue will shift his approach to the 400 IM in 2026? Should the emphasis be on refining the backstroke leg to chase faster concessions, or is the current balance already optimal? What factors most influence a swimmer’s ability to convert a record-setting performance at a meet like the U.S. Open into podium success at Worlds or the Olympics? Share your take in the comments.
