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 2Men’s 400 Freestyle – Finals
World Record: 3:39.96 – Lukas Martens, Germany (2025) U.S. Open Record: 3:43.33 – Rex Maurer, USA (2025) Meet Record: 3:45.63 – Zane Grothe, 2016Top 8 Finishers
Luka Mijatovic broke his own 15-16 National Age Group (NAG) record with a 3:45.30 400 freestyle en route to a 2nd place finish. That broke his own record of a 3:45.71 that he swam for 2nd at 2025 US Summer Nationals.
Split Comparison
Distance (m) New NAG Record Old NAG Record 50 25.85 25.85 26.15 26.15 100 28.09 53.94 28.18 54.33 150 28.76 1:22.70 28.57 1:22.90 200 28.67 1:51.37 28.77 1:51.67 250 29.05 2:20.42 28.96 2:20.63 300 28.72 2:49.14 28.75 2:49.38 350 28.79 3:17.93 28.74 3:18.12 400 27.37 3:45.30 27.59 3:45.71Mijatovic was out under his old record from the start and saw the biggest difference on his first and last 50s as his first and last 50 totaled a difference of -0.52 seconds.
With his swim tonight, he moves up one spot to be the #13 American in the event all-time as he passed Jake Mitchell who had a best time of a 3:45.38. He already is the fastest 18 and under ever for the US as the 17-18 NAG stands at a 3:46.01.
Nine of the top 16 swimmers in the event will have been Texas/Longhorn Aquatics swimmers in some point in their careers at Mijatovic, the top ranked recruit for 2027, committed to Texas at the end of October. Leon Marchand, Carson Foster, and Luke Hobson all train out of Texas currently.
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