The long course season is now underway, and this winter's short course results have already painted a compelling picture of where the Boys 10&Under NAG records stand. Several marks — some reaching back over a decade — are facing meaningful pressure from a strong and geographically diverse field of age-eligible swimmers.

Below is a look at each standing record, the current top candidates based on 2025–26 SCY performance, and a classical conversion projection of what those times could translate to in long course. Projections are estimates, not predictions — but they're useful for calibrating just how close (or far) the records really are.

The Record Holders & The Candidates

50 Freestyle — NAG: 27.42 | Winn Aung (2013)

Aung's 2013 sprint marks have proven durable, but this cycle's field may be the most credible threat in years. Gabriel Brown (10) leads with a 25.76 SCY — projecting to 29.39 LCM — and already owns a real LCM best of 29.83 from last summer, which is well within striking range of the record. Robert Legg (10) is close behind at 25.99 SCY (29.65 projected), with a last season LCM best of 30.09 that confirms he converts well. Christian Briscoe (10) rounds out the group at 26.39 SCY (30.09 projected), showing solid improvement from his 31.20 LCM reference last spring.

Brown's 29.83 real LCM best is the headline here — he's already been within 0.41 of the record. This one is worth watching closely this summer.

100 Freestyle — NAG: 1:00.67 | Winn Aung (2013)

The 100 free tells a similar story. Gabriel Brown leads again at 55.01 SCY (1:02.66 projected), with a last season LCM best of 1:04.29 — already competitive at this age. Robert Legg follows at 56.47 SCY, projecting to 1:04.28, and his real LCM best of 1:04.82 is essentially in line with that projection. Isen Wolfe (10) rounds out the group at 56.99 SCY (1:04.86 projected), with a 1:06.14 last season LCM best showing continued progress.

The record holds for now, but Brown's trajectory across the sprint and distance free events makes him the most compelling 10-under story on the boys' side this cycle.

200 Freestyle — NAG: 2:11.32 | Winn Aung (2013)

This is the most compelling event in the dataset. Gabriel Brown projects to 2:12.83 LCM from his 1:56.78 SCY — just 1.51 seconds above the NAG record. His last season LCM best of 2:16.77 already shows strong long course form, and given the gap between his SCY level and what he's already done in the 50-meter pool, a sub-2:12 swim this summer is a realistic outcome. Robert Legg (2:00.49 SCY, 2:16.94 projected) and Isen Wolfe (2:03.89 SCY, 2:20.72 projected) are further back, though Wolfe's last season LCM best of 2:21.93 closely mirrors his projection.

This is the record most likely to fall in 2026. Brown's conversion math puts him right on top of it, and his existing LCM best confirms he can perform in long course.

400 Freestyle — NAG: 4:36.22 | Adam Hinshaw (2004)

The oldest record in this dataset by a wide margin — set in 2004 — and it may finally be in genuine jeopardy. Gabriel Brown projects to 4:35.80 LCM from his 5:09.02 SCY, which would be a record by 0.42 seconds. His last season LCM best of 4:54.47 shows there's still meaningful ground to cover in actual long course swimming, but the trajectory is steep. Robert Legg projects to 4:45.17 and Isen Wolfe to 4:48.77 — both well off the record, but showing healthy development with last season LCM bests in the 4:55–5:00 range.

The conversion puts Brown just under the record, but his real LCM best of 4:54 suggests the projection may be optimistic. Still, a 22-year-old NAG finally has a legitimate challenger.

50 Backstroke — NAG: 30.82 | Ayden Tan (2023)

One of three records Ayden Tan set in 2023, and arguably the most protected of the group given how recently it was established. Gabriel Brown leads at 29.06 SCY (32.86 projected), but his last season LCM best of 34.32 from an April meet last year indicates limited long course backstroke experience so far. Micah Pearson (10) follows at 29.49 SCY (33.33 projected), though his only LCM reference appears to be a 100 back time — suggesting his 50 back LCM history is minimal. Hoshi Aono (10) rounds out the group at 29.76 SCY (33.63 projected), with a 36.07 last season LCM best that leaves room to improve.

All three candidates project 2+ seconds above the record. Safe for now — Tan's 2023 marks are proving resilient.

100 Backstroke — NAG: 1:07.40 | Ronald Dalmacio (2015)

Gabriel Brown leads the 100 back field with a 1:01.12 SCY (1:09.04 projected) — just 1.64 seconds above the record on paper. His last season LCM best of 1:12.09 suggests the projection is ahead of where he's been in long course, but given his development arc across other events, meaningful improvement is plausible. Hoshi Aono (10) and Isen Wolfe (10) both project to the 1:12.67–1:12.73 range, with last season LCM bests of 1:16.85 and 1:16.14 respectively — a clear signal that both have been improving steadily in long course.

Brown's projection is intriguing, but his real LCM baseline puts this record at arm's length for now. One to watch mid-summer.

50 Breaststroke — NAG: 35.65 | Matthew Limbacher (2011)

A 2011 record that has held through several strong cycles. The current field converts in the 38.1–39.2 range — a gap that keeps it comfortable. George Xuan (10) leads at 33.45 SCY (38.13 projected), with a last season LCM best of 40.53, while Gabriel Brown is right behind at 33.74 SCY (38.45 projected) with a 40.48 last season LCM best. The two are nearly identical on paper. Zhecheng Zhu (10) rounds out the group at 34.40 SCY (39.18 projected), though his last season LCM best of 47.17 from a June league meet suggests very limited long course breaststroke experience to date.

Record is well protected. Xuan and Brown are neck-and-neck and both improving, but a 2.5-second gap is real at this age.

100 Breaststroke — NAG: 1:18.56 | Ayden Tan (2023)

Another 2023 Tan record, and like the 50 back, it still has a comfortable cushion. Gabriel Brown leads at 1:12.31 SCY (1:22.26 projected), with a last season LCM best of 1:28.80 — indicating his projection is well ahead of where he's been in long course breast. George Xuan follows at 1:12.86 SCY (1:22.87 projected) and already has a real LCM best of 1:28.76 — nearly identical to Brown's. Isen Wolfe (10) is third at 1:14.41 SCY (1:24.60 projected), with a 1:33.41 LCM reference that suggests he's still early in his long course breaststroke development.

Tan's 2023 marks continue to hold. The field is developing but not yet threatening.

50 Butterfly — NAG: 29.91 | Carson Foster (2012)

Carson Foster's 2012 mark is still standing, and the current field converts in the 31.5–32.6 range — about 1.6–2.7 seconds off on paper. Robert Legg leads at 27.77 SCY (31.52 projected), with a last season LCM best of 31.77 that is essentially in line with his conversion — a strong sign of LCM efficiency. Gabriel Brown follows at 28.21 SCY (32.01 projected), with a 32.84 last season LCM best showing improvement is coming. Christian Briscoe (10) rounds out the group at 28.77 SCY (32.63 projected), already having gone 32.90 in long course last summer.

Legg's 31.77 real LCM best is the most telling number here — he's already been within 1.86 of the record and converts cleanly.

100 Butterfly — NAG: 1:05.98 | Andrew Rogers (2015)

A tight three-way race at the top of this event. Gabriel Brown leads at 1:01.91 SCY (1:10.12 projected), with a real LCM best of 1:10.33 — meaning his prior long course performance is already close to his projection, a strong sign. Robert Legg follows at 1:02.14 SCY (1:10.38 projected), and notably already has a 1:10.10 real LCM best — fractionally better than Brown's. Sean Northup (10) rounds out the group at 1:02.96 SCY (1:11.29 projected), with a 1:12.66 last season LCM best showing steady progress.

Brown and Legg are essentially tied on projection, and both have real LCM bests right in the 1:10 range. The record has a 4-second cushion, but this event has two swimmers already operating at a high long course level.

200 IM — NAG: 2:27.38 | Ayden Tan (2023)

The third and final Tan record in this dataset, and the most recently set. Gabriel Brown projects to 2:29.34 from his 2:11.66 SCY — just 1.96 seconds above the record on paper — making this, alongside the 200 free, one of the two most vulnerable records in the dataset. His last season LCM best of 2:35.03 suggests the projection is ahead of where he's been, but his development curve across all four strokes is steep. Robert Legg (2:17.08 SCY, 2:35.36 projected) and Isen Wolfe (2:19.39 SCY, 2:37.92 projected) are further back, with both showing healthy improvement from their last season LCM bests.

Another record where Brown's conversion math puts him right on the doorstep. Whether his long course IM catches up to his SCY form this summer is the central question.

Recurring Names & Overall Takeaways

The Boys 10&Under field this cycle is defined by one dominant story and a genuinely competitive supporting cast:

• Gabriel Brown (10) appears in every single event in this dataset — an almost unprecedented level of cross-discipline breadth at this age. His projections in the 200 free, 400 free, and 200 IM all sit within striking distance of standing NAG records.
• Robert Legg (10) is the strongest challenger to Brown across the sprints and fly events, with a long course track record that closely mirrors his conversion projections — a sign of genuine LCM efficiency.
• Isen Wolfe (10) is a consistent mid-distance presence across free, back, breast, and IM, with last season LCM bests that largely align with his projections.
• George Xuan (10) and Christian Briscoe (10) are event-specific threats — Xuan in breaststroke, Briscoe in the sprints — both with developing long course résumés.

The 200 free and 200 IM are the records to watch most closely this summer. Both involve Brown projecting within 2 seconds of marks that have stood since 2013 and 2023 respectively. Whether his short course form translates cleanly to long course — and how much he's improved since last summer — will be the defining question of the Boys 10&Under NAG landscape in 2026.

All projections use classical SCY-to-LCM conversion. Converted times are estimates only. Age eligibility based on August 1, 2026 cutoff.