swimMason Nishimura
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 50 Freestyle | SCY | 24.56 | A+0.87s to AA | 2026-03-01 | 2026 HI Hawaiian Swimming SCY AGChamps fast pool |
| 100 Freestyle | SCY | 54.18 | A+2.19s to AA | 2025-10-25 | 2025 HI 25th Annual Bill Smith Invitational - venue |
| 200 Freestyle | SCY | 2:01.52 | BB+2.93s to A | 2025-10-26 | 2025 HI 25th Annual Bill Smith Invitational - venue |
| 500 Freestyle | SCY | 6:01.31 | B+11.82s to BB | 2024-12-07 | 2024 44th Annual Ken Suenaga Invitationsl |
| 1000 Freestyle | SCY | 12:23.54 | B+15.85s to BB | 2024-12-07 | 2024 44th Annual Ken Suenaga Invitationsl |
| 50 Backstroke | SCY | 32.63 | B+2.34s to BB | 2025-01-13 | 1592796 |
| 100 Backstroke | SCY | 1:05.29 | B+0.80s to BB | 2026-02-15 | OSL Senior B SCY Meet fast pool |
| 200 Backstroke | SCY | 2:26.06 | B+5.07s to BB | 2025-12-07 | 45th Annual Ken Suenaga Invitational (SCY) venue |
| 50 Breaststroke | SCY | 36.92 | B+2.13s to BB | 2025-01-13 | 1592796 |
| 100 Breaststroke | SCY | 1:15.61 | B+2.62s to BB | 2025-10-26 | 2025 HI 25th Annual Bill Smith Invitational - venue |
| 200 Breaststroke | SCY | 2:44.65 | B+5.46s to BB | 2025-10-25 | 2025 HI 25th Annual Bill Smith Invitational - venue |
| 50 Butterfly | SCY | 27.48 | A+0.89s to AA | 2026-02-28 | 2026 HI Hawaiian Swimming SCY AGChamps fast pool |
| 100 Butterfly | SCY | 59.76 | BB+0.87s to A | 2025-10-26 | 2025 HI 25th Annual Bill Smith Invitational - venue |
| 200 Butterfly | SCY | 2:19.10 | BB+7.11s to A | 2025-10-25 | 2025 HI 25th Annual Bill Smith Invitational - venue |
| 100 Individual Medley | SCY | 55.42 | 2025-03-20 | Southwest Age Group Regional 2025 | |
| 200 Individual Medley | SCY | 2:19.50 | BB+7.31s to A | 2025-09-27 | OSL Senior SCY Meet |
| 400 Individual Medley | SCY | 5:20.95 | B+13.06s to BB | 2024-12-07 | 2024 44th Annual Ken Suenaga Invitationsl |
| 50 Freestyle | LCM | 27.34 | AA+1.15s to AAA | 2026-07-03 | 2026 Keo Nakama Swim Meet venue |
| 100 Freestyle | LCM | 1:01.30 | A+1.61s to AA | 2026-07-05 | 2026 Keo Nakama Swim Meet venue |
| 200 Freestyle | LCM | 2:19.02 | BB+1.83s to A | 2026-06-07 | 2026 15th Annual Wada Rainbow Invitational - venue |
| 400 Freestyle | LCM | 5:09.35 | BB+17.26s to A | 2026-07-03 | 2026 Keo Nakama Swim Meet venue |
| 800 Freestyle | LCM | 11:29.89 | B+35.60s to BB | 2024-01-01 | 1508169 |
| 50 Backstroke | LCM | 40.11 | +1.42s to B | 2023-07-02 | 2023 Keo Nakama Swim Meet venue |
| 100 Backstroke | LCM | 1:18.66 | B+3.27s to BB | 2025-06-07 | 2025 14th Annual Wada Rainbow Invitational |
| 200 Backstroke | LCM | 2:44.91 | B+1.22s to BB | 2025-07-17 | 2025 HI Age Group LCM Championship |
| 50 Breaststroke | LCM | 45.94 | +3.35s to B | 2023-06-03 | 2023 HI 12th Annual Rainbow Aquatics Invite venue |
| 100 Breaststroke | LCM | 1:30.24 | B+5.35s to BB | 2026-05-23 | OSL A+ LCM Meet venue |
| 200 Breaststroke | LCM | 3:11.87 | B+6.18s to BB | 2026-06-06 | 2026 15th Annual Wada Rainbow Invitational - venue |
| 50 Butterfly | LCM | 29.92 | AA+1.23s to AAA | 2025-07-17 | 2025 HI Age Group LCM Championship |
| 100 Butterfly | LCM | 1:08.46 | BB+1.17s to A | 2026-05-16 | Punahou Quad Meet venue |
| 200 Butterfly | LCM | 2:41.21 | BB+10.62s to A | 2026-07-05 | 2026 Keo Nakama Swim Meet venue |
| 200 Individual Medley | LCM | 2:38.15 | BB+4.96s to A | 2026-07-03 | 2026 Keo Nakama Swim Meet venue |
| 400 Individual Medley | LCM | 6:35.54 | +11.35s to B | 2023-03-11 | 2023 HI Oahu Distance Meet venue |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 15.
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 | 25.77 | flying | 200 Free Relay (leg 2) | 2025-03-22 | Southwest Age Group Regional 2025 |
| 50 Freestyle | SCY | 24.67 | flying | 200 Medley Relay (leg 4) | 2025-03-22 | Southwest Age Group Regional 2025 |
| 100 Freestyle | SCY | 55.46 | flying | 400 Medley Relay (leg 4) | 2025-03-21 | Southwest Age Group Regional 2025 |
| 100 Freestyle | SCY | 55.46 | flying | 400 Free Relay (leg 2) | 2025-03-23 | Southwest Age Group Regional 2025 |
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 · LCM
2899 points (6/6 events)
| Event | Time | Points |
|---|---|---|
| 400 FR LCM | 5:09.35 | 531 |
| 200 BK LCM | 2:44.91 | 480 |
| 200 BR LCM | 3:11.87 | 439 |
| 200 FL LCM | 2:41.21 | 509 |
| 200 IM LCM | 2:38.15 | 582 |
| 400 IM LCM | 6:35.54 | 358 |
IMR 15-16 · SCY
2635 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 2:01.52 | 591 |
| 100 BK SCY | 1:05.29 | 467 |
| 100 BR SCY | 1:15.61 | 444 |
| 100 FL SCY | 59.76 | 599 |
| 200 IM SCY | 2:19.50 | 534 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
500 Freestyle SCY 6:01.31 split/total mismatch
100 Backstroke SCY 1:05.29
Front half 31.55s · back half 33.74s
200 Individual Medley SCY 2:19.50 split/total mismatch
400 Individual Medley SCY 5:20.95 split/total mismatch
200 Freestyle LCM 2:19.02
Front half 66.12s · back half 72.90s
400 Freestyle LCM 5:09.35
Front half 148.43s · back half 160.92s
200 Breaststroke LCM 3:11.87
Front half 93.10s · back half 98.77s
200 Butterfly LCM 2:41.21
Front half 74.51s · back half 86.70s
200 Individual Medley LCM 2:38.15
Front half 71.88s · back half 86.27s
400 Individual Medley LCM 6:35.54
Front half 191.86s · back half 203.68s
Progression
Faster times are higher. One card per event, all courses & history.