By Sean Griffin on SwimSwam
2025 CA/NV December Sectionals
December 19-22, 2025 Walnut, CA SCY (25 Yards) Live Results Available on Meet Mobile — “2025 CA-NV December Sectionals At BREA – cop”During the third finals session of the CA/NV December Sectionals, 16-year-old Luka Mijatovic clocked 4:09.34 to win the 500 freestyle by ten seconds, posting the second-fastest time in 15-16 age group history.
His personal best and 15-16 National Age Group Record stands at 4:08.57, which he swam at the Pleasanton Seahawks’ SC Senior Meet last month. The time ranks him as the 17th-fastest performer of all time and the quickest in 15-16 age group history by 6.79 seconds.
Mijatovic was under record pace early, opening in 46.45 through the 100 and 1:36.83 at the 200, under his record splits of 47.17 and 1:37.64. He began to fall off pace by a tenth or two at each 50 after the 200, before falling off by 0.01 at the 450-yard turn. He split 0.44 slower on the ninth 50 and 0.76 seconds slower on the final 50, finishing 0.77 seconds off his best time.
See a full splits comparison between the two swims below.
Splits Comparison
Mijatovic Tonight Mijatovic’s National Age Group Record 50-yards 22.16 22.50 100-yards 24.29 (46.45) 24.67 (47.17) 150-yards 24.96 (1:11.41) 25.21 (1:12.38) 200-yards 25.42 (1:36.83) 25.26 (1:37.64) 250-yards 25.38 (2:02.21) 25.45 (2:03.09) 300-yards 25.56 (2:27.77) 25.31 (2:28.40) 350-yards 25.51 (2:53.28) 25.49 (2:53.89) 400-yards 25.57 (3:18.86) 25.40 (3:19.29) 450-yards 25.52 (3:44.38) 25.08 (3:44.37) 500-yards 24.96 (4:09.34) 24.20 (4:08.57)Earlier in the meet, the Texas commit smashed the 15-16 NAG in the 1650 free by over seven seconds with a time of 14:30.01.
He then broke 1:33 for the first time in the 200 free, winning in 1:32.73, the 2nd-best time in age group history behind only Thomas Heilman‘s 2023 NAG Record of 1:32.46.
Mijatovic also won the 400 IM in a best time of 3:40.96, improving his own #2 all-time ranking (3:41.75 from April) to move closer to Maximus Williamson‘s 2022 record of 3:39.83.
He’s slated to take on the 100 free and 1000 free to close out the meet tomorrow. In the latter, he holds the 15-16 Record with a time of 8:37.01 from last month, just over three seconds shy of Clark Smith‘s 2015 American Record of 8:33.93. Given he’s PB’d in the 200 and 1650 thus far and was right on his 500 best, both his speed and endurance are clearly on, meaning both records could be on watch.
The 16-year-old Pleasanton Seahawk has been a National Age Group record-breaking machine over the past five years, setting a total of 23 NAG Records under coach Steve Morsilli.
Earlier this month at the U.S. Open, he won the 800 free in 7:48.28, breaking the NAG Record of 7:52.05 that had stood since Larsen Jensen set it at the 2002 Pan Pac Championships. He also clocked 3:45.30 to reset the 400 free NAG Record and finish second overall.
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