By Sean Griffin on SwimSwam
2025 Pleasanton Seahawks SC Senior Meet
November 7th-9th, 2025 Pleasanton, CA SCY (25 Yards) Full Meet Results: “Pleasanton Seahawks SC Senior 2” on Meet MobileDuring tonight’s final session of the Pleasanton Seahawks SC Senior Meet, Luka Mijatovic swam 4:08.57 to obliterate his own 15–16 National Age Group Record in the 500 freestyle, improving on the 4:10.38 he had set just hours earlier in the prelims.
The swim marks his third NAG of the weekend, having already gone 8:37.01 to lower his own record in the 1000 free on Friday.
Before today, his best time stood at 4:10.96 from the Pacific Swimming Far Western Championships in April.
Compared to his prelim swim, Mijatovic built a slight cushion through the first 300 yards before dominating the back half. He was 0.05 seconds faster than record pace on the opening 50, then 0.03 ahead at the 100, 0.12 by the 150, and 0.22 by the 200. At the halfway point, he was 0.32 seconds ahead of his morning pace and continued to widen that margin—0.43 seconds under at 300, 0.48 at 350, 0.81 at 400, and 1.39 at 450.
Mijatovic ultimately closed with a 24.20 final 50 split to finish 1.81 seconds faster than his prelim time.
See a full splits comparison between his three fastest record swims below.
Splits Comparison
Mijatovic’s New National Age Group Record Mijatovic’s Former National Age Group Record (From Prelims) Mijatovic’s National Age Group Record From April 50-yards 22.50 22.45 22.96 100-yards 24.67 (47.17) 24.75 (47.20) 25.02 (47.98) 150-yards 25.21 (1:12.38) 25.30 (1:12.50) 25.57 (1:13.55) 200-yards 25.26 (1:37.64) 25.36 (1:37.86) 25.87 (1:39.42) 250-yards 25.45 (2:03.09) 25.55 (2:03.41) 25.69 (2:05.11) 300-yards 25.31 (2:28.40) 25.42 (2:28.83) 25.50 (2:30.61) 350-yards 25.49 (2:53.89) 25.54 (2:54.37) 25.38 (2:55.99) 400-yards 25.40 (3:19.29) 25.73 (3:20.10) 25.50 (3:21.49) 450-yards 25.08 (3:44.37) 25.66 (3:45.76) 25.36 (3:46.85) 500-yards 24.20 (4:08.57) 24.62 (4:10.38) 24.11 (4:10.96)Mijatovic now ranks as the 17th-fastest performer in the history of the event. See the full list below.
All-Time Top Performers:
Leon Marchand– 4:02.31 (2024 NCAA Championships) Rex Maurer– 4:04.45 (2024 Texas Invite) Carson Foster– 4:05.81 (2024 Texas Invite) Kieran Smith– 4:06.32 (2020 SEC Championships) Luke Hobson– 4:06.34 (2025 NCAA Championships) Matthew Sates– 4:06.61 (2022 NCAA Championships) Jake Magahey– 4:06.71 (2021 SEC Championships) Lucas Henveaux– 4:06.74 (2025 NCAA Championships) Zane Grothe– 4:07.25 (2017 Winter Nationals) Noah Millard– 4:07.68 (2025 Ivy League Championships) Townley Haas– 4:08.19 (2019 NCAA Championships) Tomas Koski– 4:08.25 (2025 SEC Championships) Drew Kibler– 4:08.26 (2020 Texas First Chance Invitational) Clark Smith– 4:08.42 (2017 NCAA Championships) Peter Vanderkaay– 4:08.54 (2008 Michigan Open) Jovan Lekic– 4:08.55 (2025 NCAA Championships) Luka Mijatovic– 4:08.57 (2025 Pleasanton Seahawks SC Senior Meet)*For comparison’s sake, Mijatovic’s time would have placed him fifth after prelims at last year’s Division I NCAA Championships and into the championship final, where his time would have ranked fourth.
Furthermore, he narrowly missed undercutting the current 17-18 NAG standard in the event, Luke Hobson‘s 4:08.42 from 2022.
When Mijatovic moved into the 15–16 age bracket, the NAG record in the event was Drew Kibler’s 4:15.36. He has already shaved 6.79 seconds off that mark and still has until April to keep chipping away at it before turning 17.
Earlier in the meet, the Texas commit smashed the 15-16 NAG in the 1000 free with a time of 8:37.01, won the 200 IM in a best time of 1:44.28, and took the 200 free in his second-fastest time ever, 1:33.74.
The 16-year-old Pleasanton Seahawk has been a National Age Group record-breaking machine over the past five years, having now set a total of 20 NAG records. This past summer, he also made his debut on the senior international stage, qualifying for the U.S. roster at the 2025 World Championships.
In June, Mijatovic was the runner-up in the men’s 400 freestyle at the 2025 U.S. National Championships in a time of 3:45.71, re-lowering the boys’ 15-16 NAG record he reset in the prelims (3:45.89) to earn a berth on the Worlds team. Both swims were also under the current 17-18 NAG record, which had been on the books since 2004, from Larsen Jensen (3:46.08) until Ryan Erisman (3:46.01) broke it in the final at Nationals.
Two days prior to that swim, Mijatovic did the same thing in the 200 free, clocking 1:45.92 to break the 15-16 NAG record of 1:47.29 held by Maximus Williamson while also going under the 17-18 record held by none other than Michael Phelps (1:45.99).
At the 2025 World Championships, although unconfirmed, results indicate Mijatovic was likely one of the many U.S. swimmers to have been dealing with illness at the meet, having added 14 seconds in the 400 free prelims and placing 36th.
He also represented the U.S. on the international stage at the 2024 Junior Pan Pacific Championships, when, despite being just 15, he won gold in the 200 free, 400 free and 4×200 free relay.
Read the full story on SwimSwam: Luka Mijatovic Obliterates His Own 15–16 500 Free NAG Record With 4:08.57 In Pleasanton
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