The Sub-20 Club: How Rare Is A Boys 18&U 50 Free Under 20 Seconds?
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A deep dive into one of age group swimming's most exclusive milestones — and the names rewriting the record books
Breaking 20 seconds in the 50 yard freestyle is one of junior swimming's most coveted benchmarks. It separates the very good from the elite, the recruits from the commits, the contenders from the future Olympians. Over the past three seasons — 2023–24, 2024–25, and 2025–26 — a combined 76 unique swimmers have cracked the barrier across 94 total swims. Here's a full breakdown of who's doing it, how the numbers are trending, and the names you need to watch.
By the Numbers
Season Sub-20 Swims Unique Swimmers 2023–24 29 28 2024–25 32 32 2025–26 33 32 Total 94 76 The trend line is clear: more boys are going sub-20 every year. The 2025–26 season — still in progress at time of publication — has already matched last year's total swimmer count with a new high of 33 swims. That's a 14% increase in sub-20 performances over just three seasons, a sign that the standard of American junior sprinting is rising fast.
Season-by-Season Leaders
2023–24 Season
The season belonged to Lucca Battaglini (East Carolina Aquatics), who posted the fastest junior mark of the year at 19.06 at the Speedo East Winter Junior Championships in December 2023 — a scorching swim that put the field on notice. Right behind him was a name that would become one of the most talked-about sprinters of his generation.
Thomas Heilman (Cavalier Aquatics, VA) clocked 19.24 at just 16 years old — a 1009 power point swim that led all 15–16 age groupers by a country mile. Heilman would go on to appear sub-20 multiple times across the dataset, cementing his status as the premier young sprinter in the country.
Top 10 — 2023–24 Season
# Swimmer Club Age Time Meet 1 Lucca Battaglini East Carolina Aquatics 18 19.06 2023 Speedo East Winter Junior Champs 2 Thomas Heilman Cavalier Aquatics 16 19.24 2023 Speedo East Winter Junior Champs 3 Mason Krings New Hope Crystal Plymouth Swim 16 19.33 2023 Fall Western Great Lakes Open 4 Maximus Williamson Lakeside Aquatic Club 17 19.46 2023 West Speedo Winter Juniors 5 Marre Gattnar Northbay Aquatics 17 19.53 2023 West Speedo Winter Juniors 6 Marvin Johnson McCallie / GPS Aquatics 18 19.56 2024 SE TISCA HS State Championship 7 Kaii Winkler Eagle Aquatics 17 19.59 2023 FL FHSAA Class 1A Championships 8 Spencer Nicholas Nashville Aquatic Club 18 19.64 2023 Speedo Winter Junior Championships – East 9 Diggory Dillingham Bend Swim Club 18 19.67 2023 West Speedo Winter Juniors 10 Devin Dilger OLY Swimming 18 19.69 2023 Speedo East Winter Junior Champs Notable mentions: Michael Rice (SwimMAC Carolina) went 19.79 at age 15 — one of the most eye-popping performances in the dataset. A 15-year-old going sub-20 is almost unheard of, and it foreshadowed what was to come from Rice in subsequent seasons. Andy Kravchenko (Bolles School Sharks) added a 19.87 at 16 from the Speedo East Winter Junior Champs.
2024–25 Season
The 2024–25 season saw the largest single-season class of sub-20 performers, with 32 unique swimmers breaking the barrier — and no repeats, meaning every swimmer who went sub-20 this year did so for the first time in a season (a testament to how deep the pipeline has gotten).
The headline of the year was Maximus Williamson (Lakeside Aquatic Club, TX) stepping up in a major way. After going 19.46 as a 17-year-old in 2023–24, Williamson returned in his senior season and dropped to 19.08 at the UIL 6A State Championships — the fastest junior time of the entire three-season span at the time. A Texas high school state meet producing a 19.08 is the kind of swim that gets coaches talking for years.
Joining him near the top was Ethan Reniewicki (Scottsdale Aquatic Club) at 19.26, and Thomas Heilman again at 19.26 — this time as a 17-year-old at Winter Juniors East, showing remarkable consistency across two age groups.
Top 10 — 2024–25 Season
# Swimmer Club Age Time Meet 1 Maximus Williamson Lakeside Aquatic Club 18 19.08 2025 ST UIL 6A State 2 Ethan Reniewicki Scottsdale Aquatic Club 18 19.26 2025 AZ SAC Short Course Qualifier 2 Thomas Heilman Cavalier Aquatics 17 19.26 2024 Winter Juniors East 4 Seth Crow Unattached (AZ) 18 19.46 2024 West Speedo Winter Juniors 5 Tyler Porter QuickSilver 16 19.49 2024 West Speedo Winter Juniors 6 Albert Smelzer Swim GSA 17 19.51 2025 GA Southeastern Meet of Champions 7 Miles Blackson-Dunbar Alpha Aquatics 17 19.53 2024 West Speedo Winter Juniors 8 Mike Rice Mecklenburg Swim Association 16 19.62 2025 GA Best Of The South 9 Kaii Winkler Eagle Aquatics 18 19.63 2024 Winter Juniors East 10 Andy Kravchenko Bolles School Sharks 17 19.65 2024 Winter Juniors East Notable mention: Tyler Porter (QuickSilver) going 19.49 at 16 at Winter Juniors West is a massive swim. Porter looks like a name to follow closely heading into 2025–26.
2025–26 Season
The current season has already matched prior seasons in volume and pushed the quality ceiling even higher. A cluster of familiar names have returned faster, and several new ones have burst onto the scene.
Albert Smelzer (Greensboro Swimming Association) leads the 2025–26 class with a 19.26 at the GA Southeastern Meet of Champions — his third consecutive sub-20 season, having gone 19.96 at age 16, 19.51 at 17, and now 19.26 at 18. That improvement arc is one of the best in this entire dataset.
Mike Rice (Mecklenburg Swim Association) continues his trajectory with a 19.28 — going from 19.79 at age 15, to 19.62 at 16, to 19.28 at 17. If that curve holds, a 19-low or even sub-19 is well within conversation by his senior year.
Three swimmers tied at 19.28–19.30 highlight just how competitive the top of this class is: Jordan Ragland (Life Time Northern California) at 19.28, and Yury Kuzmenko (Valley Splash) at 19.30 — Kuzmenko at just 17, clocking that at the CCS Championships in May 2026.
Top 10 — 2025–26 Season
# Swimmer Club Age Time Meet 1 Albert Smelzer Greensboro Swimming Association 18 19.26 2026 GA Southeastern Meet of Champions 2 Mike Rice Mecklenburg Swim Association 17 19.28 2026 NC TAC Speedo Champions Series 2 Jordan Ragland Life Time Northern California 17 19.28 2025 Speedo Winter Junior Championships – West 4 Yury Kuzmenko Valley Splash 17 19.30 2026 CCS Swimming & Diving Championships 5 Miles Blackson-Dunbar UNATT-CITI (SCS) 18 19.37 2025 Speedo Winter Junior Championships – West 6 Jake Lloyd St. Charles Preparatory School 18 19.39 2026 OH OHSAA State Championships 6 Blake Tebeest McFarland Spartan Sharks 17 19.39 2026 WI WIAA Boys Division 2 HS State 8 Brady Campbell Mason Manta Rays 17 19.48 2026 OH Tim Myers SC Senior Champ 9 Tyler Porter QuickSilver 17 19.52 2025 Speedo Winter Junior Championships – West 10 Ty Thomas River City Aquatics 16 19.61 2026 MV CSC Region VIII Speedo Sectionals Notable mentions: Blake Tebeest went from 19.99 at 16 (2024–25) to 19.39 at 17 — a massive 0.60-second drop in one season. Ty Thomas (River City Aquatics) going 19.61 at age 16 flags him as a serious one to watch over the next two seasons.
Multi-Season Performers: The True Elite
Only a handful of swimmers have gone sub-20 in multiple seasons — a distinction that separates those who peaked early from those building something bigger.
Swimmer 2023–24 2024–25 2025–26 Thomas Heilman 19.24 (age 16) 19.26 (age 17) — Maximus Williamson 19.46 (age 17) 19.08 (age 18) — Albert Smelzer 19.96 (age 16) 19.51 (age 17) 19.26 (age 18) Mike Rice 19.79 (age 15) 19.62 (age 16) 19.28 (age 17) Kaii Winkler 19.59 (age 17) 19.63 (age 18) — Andy Kravchenko 19.87 (age 16) 19.65 (age 17) — Tyler Porter — 19.49 (age 16) 19.52 (age 17) Miles Blackson-Dunbar — 19.53 (age 17) 19.37 (age 18) Blake Tebeest — 19.99 (age 16) 19.39 (age 17) Albert Smelzer and Mike Rice are the only two swimmers to appear sub-20 (or right on the line) across all three seasons, with a perfect improvement arc each year. Mike Rice has the most jaw-dropping trajectory: going sub-20 first at age 15, and dropping time in each subsequent season. If Rice stays healthy, a sub-19 bid before he ages out is not far-fetched.
Where Are They Coming From? Zone Breakdown
The Southern Zone continues to dominate the sprint pipeline, but the Central and Eastern Zones are closing the gap fast.
Zone Sub-20 Swims (3 seasons) Southern (SZ) ~38 Eastern (EZ) ~22 Western (WZ) ~22 Central (CZ) ~12 Winter Juniors — both East and West — remain the premier proving ground, accounting for the largest single-meet cluster of sub-20 performances across all three years. High school state championships are increasingly becoming breakthrough venues too, with UIL 6A (TX), OHSAA, VHSL, and NCHSAA all producing sub-20 swims in this window.
Ages of the Sub-20 Club
Breaking down by age group tells a striking story about where these swims are coming from developmentally.
Age Group Sub-20 Swims (3 seasons) 17–18 ~75 15–16 ~19 The 15–16 sub-20s are the rarest and the most exciting — Rice at 15, Heilman at 16, Krings at 16, Kravchenko at 16, Porter at 16, Kuzmenko at 16, Thomas at 16. These are the swimmers most likely to be in Olympic conversation by the time they reach their prime.
The Bottom Line
Sub-20 in the 50 SCY free is still rare enough to matter — but the field is growing. Three seasons ago, cracking the barrier put you in a class of roughly 28 swimmers nationally. Today, 33 boys did it in a single season alone. The standard isn't getting easier; the swimmers are getting faster.
The names to circle heading into the 2026–27 season: Mike Rice (whose ceiling looks sky-high at 17), Yury Kuzmenko (19.30 at 17 is elite), Tyler Porter (two sub-20 seasons already at 17), and Blake Tebeest (dropped 0.60 in one year). Any of them could be the one rewriting what's possible in this event over the next two years.
The sub-20 club has never had more members — and it's never been more competitive.
Data sourced from SwimStandards. Covers SCY 50 Freestyle, male swimmers ages 18 and under, seasons 2023–24 through 2025–26. All swims AAAA standard or better.
