The Boys 15-16 LCM record book is a patchwork of eras. Luka Mijatovic rewrote the distance free picture in 2025, setting marks in the 200, 400, and 800 free that carry maximum recency protection. Thomas Heilman holds the butterfly events from 2023. Michael Andrew's sprint marks from 2015 and 2016 have been on the books for a decade. And tucked into the distance free section is Bob Hackett's 1500 free from 1976 — the oldest record in the dataset.

Against that backdrop, this winter's 15-16 field is among the more competitive in recent memory. Syunta Lee is the most versatile performer, leading the distance and IM picture. Kai Joyner is the other multi-event anchor. And across sprint, backstroke, and breaststroke, a deeper field of event specialists rounds out the picture.

A note on backstroke events: classical SCY-to-LCM conversion can produce aggressive results in backstroke for this age group. Where projections clip records but last-season LCM references show a larger gap, both are noted — and the real references carry more weight.

Sprint Freestyle

50 Freestyle — NAG: 22.33 | Michael Andrew (2016)

Peter Kovacs (16) leads at 20.03 SCY (23.03 projected, +3.13%), with a last-season LCM reference of 23.28 — 0.95 seconds and 4.25% above the record in actual competition. Aiden Zhou (16) follows at 20.09 SCY (23.10 projected), with a 23.35 last-season LCM reference. Hutchison Paxton (16) rounds out the group at 20.17 SCY (23.19 projected), with a 23.96 last-season LCM reference — further back in real terms.

In the 50 free at 15-16, a 1-second gap is meaningful. Kovacs and Zhou both showed ~23.3 last summer — the record has real protection, but both are tracking in the right direction for next cycle.

100 Freestyle — NAG: 48.81 | Kaii Winkler (2023)

Peter Kovacs leads at 43.79 SCY (50.21 projected, +2.87%), with a last-season LCM reference of 51.72 — 2.91 seconds above the record in actual competition. Charles Cancelmo (16) follows at 44.08 SCY (50.53 projected), with a more advanced real baseline of 51.06 (+4.61%) — the most developed real 100 free LCM time in this group. Mason Crowley (16) rounds out the group at 44.22 SCY (50.68 projected), though his 53.45 last-season LCM reference (+9.51%) reflects limited long course sprint free experience to date.

Cancelmo's 51.06 last-season LCM time leads the field on real performance — he's been within ~2 seconds of Winkler's 2023 mark in actual competition. The record is protected, but the sprint free field has real depth.

Distance Freestyle

200 Freestyle — NAG: 1:45.92 | Luka Mijatovic (2025)

Set just months ago, Mijatovic's 200 free carries the strongest recency protection in the dataset. Kai Joyner (16) leads at 1:34.91 SCY (1:48.55 projected, +2.48%), with a last-season LCM reference of 1:50.81 — 4.89 seconds and 4.62% above the record in actual competition. Noah Stotler (16) projects to 1:49.13, with a 1:53.96 last-season LCM reference reflecting a larger real gap. Charles Cancelmo rounds out the group at 1:49.36 projected, with a 1:52.45 last-season LCM reference.

Joyner's 1:50.81 last-season LCM time leads the field in real terms — within 5 seconds of a mark set just last year. The record is protected by its recency and real margin, but Joyner's development is the storyline to track.

400 Freestyle — NAG: 3:45.30 | Luka Mijatovic (2025)

Another 2025 Mijatovic record. Kai Joyner projects to 3:50.04 (+2.1%), with a last-season LCM reference of 3:56.67 — 11.37 seconds and 5.05% above the record in actual competition. Syunta Lee (16) follows at 3:52.06 projected, with a last-season LCM reference of 3:56.83 — nearly identical to Joyner's in real terms. Treyvn Krauss (16) rounds out the group at 3:53.83 projected, with a 4:01.53 last-season LCM reference.

Joyner and Lee both showed 3:56 last summer — the most credible real baselines in this event, and roughly 11 seconds above a very fresh record. The 3:50 barrier is within reach on projection; closing that gap in real swims is the summer's challenge.

800 Freestyle — NAG: 7:48.28 | Luka Mijatovic (2025)

A third 2025 Mijatovic record, and the projections here are notable. Kai Joyner projects to 7:57.54 (+1.98%), a projection gap of under 2%. His last-season LCM reference of 8:16.38, however, puts him 28 seconds above the record in actual competition — a large real gap that reflects how recently this record was set at an elite level. Owen Miklos (16) follows at 8:00.04 projected, with a last-season LCM reference of 8:22.15. Leopold Nurit (16) rounds out the group at 8:03.24 projected, with an 8:26.97 last-season LCM reference.

Mijatovic set this mark in 2025 at a level the current field hasn't reached in real competition. Last-season LCM references in the 8:16–8:27 range confirm the distance. The projection picture is encouraging for Joyner's development, but the record is firmly protected.

1500 Freestyle — NAG: 15:03.91 | Bob Hackett (1976)

The oldest record in this dataset by five decades — and this is one of the most intriguing events in the boys picture. Kai Joyner projects to 15:14.55 (+1.18%), a tight gap on paper. His last-season LCM reference of 15:40.92 (+4.09%) is the more honest measure, still 37 seconds above Hackett's mark in actual competition. Syunta Lee follows at 15:24.67 projected, with a 15:52.64 last-season LCM reference. Owen Miklos rounds out the group at 15:28.61 projected, with a 16:02.40 last-season LCM reference.

Hackett's 1976 record has survived fifty years for a reason. Joyner's last-season LCM reference of 15:40.92 is the most advanced real baseline in this event — 37 seconds above the mark in actual competition. The projection is encouraging, but the 1500 is an event where real long course performance matters more than any conversion.

Backstroke

As noted, classical conversion can be aggressive in backstroke. The 50 and 100 back projections below clip or approach records on paper — last-season LCM references are the more reliable indicator of where things actually stand.

50 Backstroke — NAG: 25.13 | Michael Andrew (2015)

All three candidates project within 0.84% of the record — with Joey Salvetti (16) projecting to 25.19 (+0.24%) and Graham Henderson (16) to 25.22 (+0.36%). Last-season LCM references tell a different story: Salvetti went 27.70 (+10.23%) and Henderson 26.84 (+6.8%) — both reflecting the typical SCY-to-LCM backstroke conversion gap at this age. Mason Crowley rounds out the group at 25.34 projected, with a 28.40 last-season LCM reference (+13.01%).

Henderson's 26.84 last-season LCM time is the most developed real reference in this event — still 1.71 seconds above the record. The projections here are a product of aggressive classical backstroke conversion; the real baselines are the honest measure.

100 Backstroke — NAG: 53.27 | Daniel Diehl (2022)

Three candidates project within a tight 54.19–54.25 window — all approximately +1.73–1.84% above the record on paper. Last-season LCM references of 58.07, 56.99, and 58.52 reflect the familiar backstroke conversion gap. Austin Chu (16) has the most developed real reference at 56.99 (+6.98%), while Grant Bellin (16) and Graham Henderson (16) showed 58.07 and 58.52 respectively last summer.

Chu's 56.99 last-season LCM time leads the field on real performance — still 3.72 seconds above Diehl's 2022 record. Classical conversion produces projections within 2% of the record, but last-season references in the 57–58 range are the realistic baseline. The record is protected.

200 Backstroke — NAG: 1:57.03 | Aaron Peirsol (2000)

The most interesting backstroke event in the boys dataset — and one where the last-season LCM references are more aligned with projections than the shorter backstroke events. Grant Bellin projects to 1:56.42 (-0.52%, fractionally under the record), with a last-season LCM reference of 2:03.55 (+5.57%) — a real gap of 6.5 seconds. Denzo Senekal (16) follows at 1:57.90 projected (+0.74%), with a more developed last-season LCM reference of 2:01.00 (+3.39%) — the most credible real baseline in this event. Derek Hernandez-Ojeda (16) rounds out the group at 1:58.07 projected, with a 2:05.84 last-season LCM reference.

Senekal's 2:01.00 last-season LCM reference is the most meaningful real data point — he's been within 3.97 seconds and 3.39% of Peirsol's 2000 record in actual competition. The backstroke conversion note applies to Bellin's projection, but the real picture across all three is encouraging. This event is one to track.

Breaststroke

50 Breaststroke — NAG: 27.45 | Ian Call (2025)

A 2025 record with strong recency protection. Reef McMeeking (15) leads at 25.17 SCY (28.94 projected, +5.43%), with a last-season LCM reference of 29.01 — essentially matching his projection, a strong sign of consistent long course breaststroke form. Parker Van Olst (16) follows at 29.13 projected, with a 29.62 last-season LCM reference. Kelly Sommer (16) rounds out the group at 29.21 projected with no last-season LCM reference available.

Call's 2025 mark has real protection at 5+% above the field. McMeeking's projection-to-reference alignment is the most encouraging sign in this event — but a 1.49-second gap in the 50 breast is not trivial.

100 Breaststroke — NAG: 1:00.17 | Josh Matheny (2019)

Wilson York (16) leads clearly at 53.56 SCY (1:01.45 projected, +2.13%), with a last-season LCM reference of 1:01.78 — 1.61 seconds and 2.68% above Matheny's record in actual competition. His projection and last-season reference are tightly aligned, confirming real long course breaststroke form. Adam Barlow (16) follows at 53.93 SCY (1:01.86 projected), with no last-season LCM reference available. Matthew Cuadros (16) rounds out the group at 54.21 SCY (1:02.17 projected), with a 1:04.31 last-season LCM reference.

York's 1:01.78 last-season LCM time makes him the most credible real-world candidate in this event — he's been within 1.61 seconds and 2.68% of Matheny's record in actual competition. A focused 100 breast long course campaign this summer is worth watching.

200 Breaststroke — NAG: 2:09.40 | Josh Matheny (2019)

Wilson York leads at 1:55.14 SCY (2:11.81 projected, +1.86%), with a last-season LCM reference of 2:13.21 — 3.81 seconds and 2.94% above Matheny's record in actual competition. His projection and reference are again closely aligned, reinforcing the same long course breaststroke efficiency he shows in the 100. Jack Maddan (16) follows at 2:12.17 projected, with a 2:16.99 last-season LCM reference. Matthew Cuadros rounds out the group at 2:14.56 projected, with a 2:19.38 last-season LCM reference.

York's 2:13.21 last-season LCM reference is the most advanced real breaststroke time in this dataset — within 3 seconds and under 3% of a 2019 record. Paired with his 100 breast profile, he's the most complete real-performance breaststroke story in the boys field.

Butterfly

50 Butterfly — NAG: 23.66 | Michael Andrew (2015)

Jackson Shawhan (16) leads at 21.46 SCY (24.52 projected, +3.63%) with no last-season LCM reference available — an unknown baseline in this event. Ian Miller (16) follows at 21.56 SCY (24.63 projected), but his last-season LCM reference of 26.11 (+10.36%) suggests he's still early in his long course 50 fly development. Dryden Finley (16) rounds out the group at 21.64 SCY (24.72 projected), with a more developed last-season LCM reference of 25.43 (+7.48%).

The record has meaningful real-world protection — last-season LCM references of 25–26 put the field 1.77–2.45 seconds above the mark in actual competition. Finley's 25.43 is the most advanced real baseline.

100 Butterfly — NAG: 51.19 | Thomas Heilman (2023)

Charlie Cancelmo leads at 46.65 SCY (53.18 projected, +3.89%), with a last-season LCM reference of 53.20 — essentially matching his projection, a clear sign he converts well in the 100 fly. Ryker Levi (16) follows at 46.94 SCY (53.50 projected), with a 55.89 last-season LCM reference (+9.18%) that reflects a much larger real gap. Hutch Paxton (16) rounds out the group at 47.21 SCY (53.80 projected), with a 53.84 last-season LCM reference — also closely aligned with his projection.

Cancelmo and Paxton both show tight projection-to-reference alignment in the 100 fly — both in the 53.2–53.8 range in last-season LCM competition. Heilman's 2023 record still has a real cushion, but those are genuinely fast real performances for this age group.

200 Butterfly — NAG: 1:53.82 | Thomas Heilman (2023)

Charles Cancelmo leads at 1:42.00 SCY (1:56.02 projected, +1.93%), with a last-season LCM reference of 1:58.27 (+3.91%) — about 4.45 seconds above the record in actual competition. Noah Stotler (16) follows at 1:59.24 projected, with a last-season LCM reference of 2:05.27 (+10.06%) — a large real gap suggesting limited long course 200 fly experience. Luke Dunn (16) rounds out the group at 1:59.73 projected, with a 2:04.62 last-season LCM reference.

Cancelmo's 1:58.27 last-season LCM time is the most developed real baseline — still 4.45 seconds above Heilman's 2023 record. His projection-to-reference alignment is again solid. The record has protection, but he's the most credible long course butterfly candidate in this field.

Individual Medley

200 IM — NAG: 1:58.65 | Maximus Williamson (2023)

Syunta Lee projects to 2:00.34 (+1.42%), with a last-season LCM reference of 2:02.94 (+3.62%) — about 4.29 seconds above the record in actual competition. Wilson York (16) follows at 2:01.07 projected, with a 2:03.75 last-season LCM reference (+4.3%). Charles Cancelmo rounds out the group at 2:01.48 projected, with a 2:08.30 last-season LCM reference — notably further back in real terms, suggesting his IM long course development trails his individual stroke form.

Lee and York both showed 2:02–2:03 last summer — the most advanced real 200 IM baselines in this group, both within 4–5 seconds of Williamson's 2023 record. Lee leads on projection; their continued development through the summer is the story in this event.

400 IM — NAG: 4:14.73 | Carson Foster (2018)

This is the most compelling event in the boys dataset. Syunta Lee projects to 4:15.48 — just 0.75 seconds and 0.29% above Foster's 2018 record on paper. His last-season LCM reference of 4:20.69 (+2.34%) puts him 5.96 seconds above the record in actual competition — a real gap, but one that aligns well with his overall development arc across distance and IM events. Kai Joyner follows at 4:18.86 projected (+1.62%), with a last-season LCM reference of 4:32.26 (+7.24%) — a much larger real gap suggesting limited 400 IM long course experience. Wilson York (16) rounds out the group at 4:19.17 projected, with a last-season LCM reference of 4:24.72 (+3.92%) — the second most developed real 400 IM baseline in the group.

Lee's 4:20.69 last-season LCM time and 0.29% projection gap make this the most credible record watch in the entire boys dataset. He's been within 6 seconds of Foster's 2018 record in real competition — and his SCY 400 IM is operating at a level that puts the record in realistic range if he can close the conversion gap. This is the event to watch most closely when the long course season begins.

Overall Picture

Two swimmers carry the Boys 15-16 narrative this cycle, each from a different angle.

Syunta Lee (16) is the most compelling story in the dataset. His 400 IM last-season LCM reference (4:20.69) is the closest any candidate gets to a standing record in real competition — 5.96 seconds and 2.34% above Foster's 2018 mark. His projection of 4:15.48 (+0.29%) is the tightest in the boys dataset. He also leads the 1500 free and 200 free fields in projection, and appeared competitively in the 200 IM and 400 free. His 400 IM is the boys event most worth watching when competition begins.

Wilson York (16) is the breaststroke anchor. His last-season LCM references of 1:01.78 in the 100 breast and 2:13.21 in the 200 breast are the most advanced real breaststroke performances in the dataset — within 2–3% of Matheny's 2019 records in both events. He also appeared in the 200 IM with a credible real baseline. His long course breaststroke form is the most consistently developed of any specialist in this field.

Kai Joyner leads on projection across the distance free events, with the most advanced last-season LCM reference in the 200 free (1:50.81). Charles Cancelmo leads the fly picture, with tight projection-to-reference alignment in both the 100 fly (53.20 last-season LCM) and 200 fly (1:58.27) — the latter representing the most credible real performance against a fly record in this dataset.

All projections use classical SCY-to-LCM conversion. Converted times are estimates only. Backstroke projections in particular can run aggressive with classical conversion — last-season LCM references are the more reliable indicator in those events. Last-season LCM reference times are from the 2024–25 season. Age eligibility based on August 1, 2026 cutoff (swimmer remains 15 or 16 as of 8/1/2026).