swimMason DeRose
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 50 Freestyle | SCY | 24.56 | A+0.87s to AA·+2.17s to Sectionals | 2026-01-01 | 2026 ne cs summer classic results |
| 100 Freestyle | SCY | 52.64 | A+0.65s to AA·+4.15s to Sectionals | 2026-01-01 | 2026 ne cs summer classic results |
| 200 Freestyle | SCY | 1:51.55 | AA+2.86s to AAA·+5.26s to Sectionals | 2026-01-01 | 2026 ne cs summer classic results |
| 500 Freestyle | SCY | 5:18.09 | A+9.00s to AA·+30.70s to Sectionals | 2026-03-14 | 2026 NE NSSC NE Cup Championshipfast pool |
| 1000 Freestyle | SCY | 11:35.55 | BB+23.76s to A·+96.06s to Sectionals | 2025-01-01 | 2025 ne cs fall classic results |
| 50 Backstroke | SCY | 28.78 | BB+0.79s to A·+5.09s to Futures | 2026-03-15 | 2026 NE NSSC NE Cup Championshipfast pool |
| 100 Backstroke | SCY | 58.87 | A+1.78s to AA·+4.38s to Sectionals | 2026-01-01 | 2026 ne cs summer classic results |
| 200 Backstroke | SCY | 2:19.48 | BB+9.39s to A·+20.89s to Sectionals | 2026-02-01 | 2026 NE CS Silver Championshipsfast pool |
| 50 Breaststroke | SCY | 36.58 | B+1.79s to BB·+10.29s to Futures | 2025-01-01 | 2025 ne cs fall classic results |
| 100 Breaststroke | SCY | 1:20.14 | +1.55s to B·+18.65s to Sectionals | 2025-10-17 | 2025 NE NSSC Beede Halloween Classic |
| 200 Breaststroke | SCY | 2:54.08 | +2.59s to B·+39.09s to Sectionals | 2025-01-01 | 2025 SHAWMUT CANDY CANE CLASSIC |
| 50 Butterfly | SCY | 26.09 | AA+0.70s to AAA·+3.20s to Futures | 2026-01-01 | 2026 ne cs summer classic results |
| 100 Butterfly | SCY | 56.02 | AA+2.03s to AAA·+2.83s to Sectionals | 2026-06-27 | 2026 NE CS Summer Classicvenue |
| 100 Individual Medley | SCY | 1:03.62 | 2025-01-01 | 2025 ne cs 14 0u imr pentathlon results | |
| 200 Individual Medley | SCY | 2:13.99 | BB+1.80s to A·+14.60s to Sectionals | 2026-03-15 | 2026 NE NSSC NE Cup Championshipfast pool |
| 400 Individual Medley | SCY | 4:47.88 | BB+3.69s to A·+32.79s to Sectionals | 2026-01-30 | 2026 NE CS Silver Championshipsfast pool |
| 50 Freestyle | LCM | 27.67 | A+0.28s to AA·+2.18s to Sectionals | 2026-08-02 | 2026 NE CS New England Summer Championshipvenue |
| 100 Freestyle | LCM | 1:00.07 | A+0.38s to AA·+4.58s to Sectionals | 2026-07-31 | 2026 NE CS New England Summer Championshipvenue |
| 200 Freestyle | LCM | 2:07.64 | AA+1.85s to AAA·+6.35s to Sectionals | 2026-07-24 | 2026 NE CS LCM 13&O Championshipsvenue |
| 400 Freestyle | LCM | 4:50.96 | A+11.07s to AA·+33.37s to Sectionals | 2026-08-02 | 2026 NE CS New England Summer Championshipvenue |
| 50 Backstroke | LCM | 32.33 | A+0.54s to AA·+4.44s to Futures | 2026-01-01 | NE CS 2026 Summer Solstice at Brown University |
| 100 Backstroke | LCM | 1:10.67 | BB+1.08s to A·+8.68s to Sectionals | 2026-07-31 | 2026 NE CS New England Summer Championshipvenue |
| 200 Backstroke | LCM | 2:35.86 | BB+4.77s to A·+21.07s to Sectionals | 2026-01-01 | 2026 ne cs spring fever results |
| 50 Breaststroke | LCM | 41.06 | B+1.47s to BB·+10.17s to Futures | 2026-01-01 | NE CS 2026 Summer Solstice at Brown University |
| 100 Breaststroke | LCM | 1:31.49 | +0.10s to B·+21.80s to Sectionals | 2026-01-01 | NE CS 2026 Summer Solstice at Brown University |
| 200 Breaststroke | LCM | 3:26.36 | +6.47s to B·+53.77s to Sectionals | 2025-06-15 | 2025 NE CS Jenny Thompson Classicvenue |
| 50 Butterfly | LCM | 29.05 | AA+0.36s to AAA·+2.76s to Futures | 2026-01-01 | 2026 NE CS 13&Over Championshipfast pool |
| 100 Butterfly | LCM | 1:03.16 | AA+1.47s to AAA·+2.97s to Sectionals | 2026-01-01 | NE CS 2026 Summer Solstice at Brown University |
| 200 Individual Medley | LCM | 2:34.04 | BB+0.85s to A·+17.85s to Sectionals | 2026-01-01 | 2026 ne cs spring fever results |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 15.
National cuts (Sectionals → Nationals) are the current-season meet qualifying times for the swimmer's zone and age group; ✓ marks the hardest cut already achieved.
Pool tags are a venue speed heuristic (median deviation of all swims there vs each swimmer's typical time) — see the venue page for the method.
Fastest relay legs
| Leg | Course | Time | Start | Relay | Date | Meet |
|---|---|---|---|---|---|---|
| 50 Freestyle | SCY | 24.71 | flat | 200 Free Relay | 2026-03-14 | 2026 NE NSSC NE Cup Championship |
| 50 Freestyle | SCY | 23.81 | flying | 200 Free Relay (leg 2) | 2025-12-14 | 2025 NE SHAWMUT Candy Cane Classic |
| 100 Freestyle | SCY | 58.33 | flat | 400 Free Relay | 2025-01-17 | 2025 NE CS Bronze Championships |
| 100 Freestyle | SCY | 51.07 | flying | 400 Free Relay (leg 4) | 2026-03-13 | 2026 NE NSSC NE Cup Championship |
| 100 Breaststroke | SCY | 1:22.78 | flying | 400 Medley Relay (leg 2) | 2025-01-17 | 2025 NE CS Bronze Championships |
| 50 Butterfly | SCY | 25.26 | flying | 200 Medley Relay (leg 3) | 2025-01-19 | 2025 NE CS Bronze Championships |
| 200 Freestyle | LCM | 2:05.64 | flying | 800 Free Relay (leg 3) | 2026-07-23 | 2026 NE CS LCM 13&O Championships |
| 100 Butterfly | LCM | 1:02.69 | flying | 400 Medley Relay (leg 3) | 2026-07-25 | 2026 NE CS LCM 13&O Championships |
Reconstructed from relay split marks. Flat = lead-off (comparable to individual times); flying starts run ~0.5–0.7s fast and are not PRs.
IMX / IMR
IMX 15-16 · SCY
2719 points (5/6 events — incomplete)
| Event | Time | Points |
|---|---|---|
| 500 FR SCY | 5:18.09 | 655 |
| 200 BK SCY | 2:19.48 | 499 |
| 200 BR SCY | 2:54.08 | 372 |
| 200 IM SCY | 2:13.99 | 602 |
| 400 IM SCY | 4:47.88 | 591 |
| 200 FL SCY | — | 0 |
IMR 15-16 · LCM
3157 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR LCM | 2:07.64 | 779 |
| 100 BK LCM | 1:10.67 | 596 |
| 100 BR LCM | 1:31.49 | 394 |
| 100 FL LCM | 1:03.16 | 758 |
| 200 IM LCM | 2:34.04 | 630 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
100 Freestyle SCY 52.64 split/total mismatch
Front half 25.80s · back half 26.84s
200 Freestyle SCY 1:51.55 split/total mismatch
500 Freestyle SCY 5:18.09
Front half 158.45s · back half 159.64s
1000 Freestyle SCY 11:35.55 split/total mismatch
100 Backstroke SCY 58.87 split/total mismatch
Front half 28.54s · back half 30.33s
200 Backstroke SCY 2:19.48
Front half 69.12s · back half 70.36s
100 Breaststroke SCY 1:20.14 split/total mismatch
Front half 38.24s · back half 41.90s
200 Breaststroke SCY 2:54.08 split/total mismatch
100 Butterfly SCY 56.02
Front half 27.18s · back half 28.84s
100 Individual Medley SCY 1:03.62 split/total mismatch
Front half 30.62s · back half 33.00s
200 Individual Medley SCY 2:13.99
Front half 62.29s · back half 71.70s
400 Individual Medley SCY 4:47.88
Front half 133.26s · back half 154.62s
200 Freestyle LCM 2:07.64
Front half 61.76s · back half 65.88s
200 Backstroke LCM 2:35.86 split/total mismatch
100 Breaststroke LCM 1:31.49 split/total mismatch
Front half 42.52s · back half 48.97s
200 Breaststroke LCM 3:26.36
Front half 96.57s · back half 109.79s
100 Butterfly LCM 1:03.16 split/total mismatch
Front half 29.81s · back half 33.35s
200 Individual Medley LCM 2:34.04 split/total mismatch
Swim history
Every recorded swim, newest first
| Date | Event | Course | Time | Age | Round | Meet |
|---|
Individual swims with a recorded date and time — including disqualifications — plus reconstructed relay legs (marked). Assembled in the browser from this page’s data.
Progression
Faster times are higher. One card per event, all courses & history.