swimKoki Yamamoto
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 50 Freestyle | SCY | 24.49 | BB+0.40s to A·+2.20s to Sectionals | 2025-03-01 | 2025 Gulf 13 & Over Champs (PEAK)fast pool |
| 100 Freestyle | SCY | 50.54 | A+0.15s to AA·+2.25s to Sectionals | 2025-01-01 | 2025 Southern Senior Championships |
| 200 Freestyle | SCY | 1:51.48 | A+0.29s to AA·+5.69s to Sectionals | 2026-10-16 | 2026 FCST October Tri Meet |
| 500 Freestyle | SCY | 5:07.18 | A+5.49s to AA·+21.09s to Sectionals | 2024-12-07 | 2024 Gulf Southern Senior Championshipsvenue |
| 100 Backstroke | SCY | 1:03.47 | B+1.38s to BB·+8.38s to Sectionals | 2024-11-02 | SSAN 2024 Fall Invitevenue |
| 50 Breaststroke | SCY | 26.47 | AAAA·Sectionals ✓+0.18s to Futures | 2026-03-05 | LAC Spring Speedo Sectionals |
| 100 Breaststroke | SCY | 57.59 | AAA+0.90s to AAAA·Futures ✓+2.10s to Winter JNs | 2025-01-01 | 2025 Southern Senior Championships |
| 200 Breaststroke | SCY | 2:03.94 | AAA+0.75s to AAAA·Futures ✓+2.35s to Winter JNs | 2026-03-05 | LAC Spring Speedo Sectionals |
| 100 Butterfly | SCY | 55.59 | A+1.30s to AA·+2.90s to Sectionals | 2025-03-02 | 2025 Gulf 13 & Over Champs (PEAK)fast pool |
| 200 Butterfly | SCY | 2:02.84 | A+0.65s to AA·+4.35s to Sectionals | 2026-03-05 | LAC Spring Speedo Sectionals |
| 200 Individual Medley | SCY | 2:00.29 | AA+2.80s to AAA·+0.90s to Sectionals | 2026-10-16 | 2026 FCST October Tri Meet |
| 400 Individual Medley | SCY | 4:10.79 | AAA+9.30s to AAAA·Sectionals ✓+3.80s to Futures | 2026-03-05 | LAC Spring Speedo Sectionals |
| 50 Freestyle | LCM | 27.43 | A+0.74s to AA·+1.84s to Sectionals | 2026-01-01 | Katy Aquatics |
| 100 Freestyle | LCM | 58.34 | A+0.25s to AA·+3.05s to Sectionals | 2026-01-01 | Katy Aquatics |
| 200 Freestyle | LCM | 2:08.71 | A+1.02s to AA·+7.82s to Sectionals | 2025-01-01 | Katy Aquatics |
| 400 Freestyle | LCM | 4:32.29 | AA+11.70s to AAA·+13.20s to Sectionals | 2025-01-01 | 2025 Texas Senior Circuit I |
| 200 Backstroke | LCM | 2:40.36 | B+1.07s to BB·+19.67s to Sectionals | 2024-06-20 | 2024 ST AAAA NS George Block Invitevenue |
| 50 Breaststroke | LCM | 30.31 | AAAA·Futures ✓+0.72s to Jr Nationals | 2026-01-01 | Texas Senior Circuit Meet IV 2026 |
| 100 Breaststroke | LCM | 1:05.78 | AAAA·Winter JNs ✓+0.69s to Jr Nationals | 2026-01-01 | Texas Senior Circuit Meet IV 2026 |
| 200 Breaststroke | LCM | 2:19.57 | AAAA·Jr Nationals ✓+0.18s to US Open | 2026-01-01 | Texas Senior Circuit Meet IV 2026 |
| 50 Butterfly | LCM | 25.70 | AAAA·Futures ✓+0.31s to Jr Nationals | 2026-01-01 | Texas Senior Circuit Meet IV 2026 |
| 100 Butterfly | LCM | 1:05.10 | A+2.71s to AA·+4.61s to Sectionals | 2024-06-21 | 2024 ST AAAA NS George Block Invitevenue |
| 200 Butterfly | LCM | 2:14.29 | AA+1.10s to AAA·Sectionals ✓+4.10s to Futures | 2025-07-10 | 2025 ST TXLA SZ LC Sectional Champsvenue |
| 200 Individual Medley | LCM | 2:16.09 | AAA+6.10s to AAAA·Sectionals ✓+3.30s to Futures | 2026-01-01 | Texas Senior Circuit Meet IV 2026 |
| 400 Individual Medley | LCM | 4:51.37 | AAA+12.28s to AAAA·Sectionals ✓+8.98s to Futures | 2026-01-01 | Texas Senior Circuit Meet IV 2026 |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 17.
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 |
|---|---|---|---|---|---|---|
| 100 Breaststroke | SCY | 1:00.10 | flying | 400 Medley Relay (leg 2) | 2024-12-08 | 2024 Gulf Southern Senior Championships |
| 200 Freestyle | LCM | 2:12.32 | flying | 800 Free Relay (leg 3) | 2024-07-20 | 2024 Texas Age Group Swimming LC Champs |
| 100 Breaststroke | LCM | 1:12.46 | flying | 400 Medley Relay (leg 2) | 2024-07-18 | 2024 Texas Age Group Swimming LC Champs |
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 17-18 · LCM
4782 points (6/6 events)
| Event | Time | Points |
|---|---|---|
| 400 FR LCM | 4:32.29 | 727 |
| 200 BK LCM | 2:40.36 | 495 |
| 200 BR LCM | 2:19.57 | 1050 |
| 200 FL LCM | 2:14.29 | 812 |
| 200 IM LCM | 2:16.09 | 851 |
| 400 IM LCM | 4:51.37 | 847 |
IMR 17-18 · SCY
3565 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 1:51.48 | 725 |
| 100 BK SCY | 1:03.47 | 457 |
| 100 BR SCY | 57.59 | 918 |
| 100 FL SCY | 55.59 | 688 |
| 200 IM SCY | 2:00.29 | 777 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
500 Freestyle SCY 5:07.18
Front half 151.97s · back half 155.21s
100 Backstroke SCY 1:03.47
Front half 31.50s · back half 31.97s
200 Breaststroke SCY 2:03.94 split/total mismatch
Front half 31.22s · back half 92.72s
100 Butterfly SCY 55.59
Front half 26.44s · back half 29.15s
200 Butterfly SCY 2:02.84 split/total mismatch
Front half 30.48s · back half 92.36s
400 Individual Medley SCY 4:10.79 split/total mismatch
50 Freestyle LCM 27.43 split/total mismatch
Front half 138.00s · back half -110.57s
200 Freestyle LCM 2:08.71
400 Freestyle LCM 4:32.29 split/total mismatch
Front half 64.86s · back half 207.43s
200 Backstroke LCM 2:40.36
Front half 79.16s · back half 81.20s
100 Butterfly LCM 1:05.10
Front half 31.28s · back half 33.82s
200 Butterfly LCM 2:14.29
Front half 64.47s · back half 69.82s
Reaction time
From electronically-timed starts only (~2% of corpus swims carry a reaction time). PRs with a recorded reaction show an RT chip in the splits section above.
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.