swimKnox O'Brien
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 50 Freestyle | SCY | 23.03 | AAAA·+0.64s to Sectionals | 2026-03-14 | 2026 Virginia Swimming SC Age Group Championsvenue |
| 100 Freestyle | SCY | 49.90 | AAAA·+1.41s to Sectionals | 2026-03-15 | 2026 Virginia Swimming SC Age Group Championsvenue |
| 200 Freestyle | SCY | 2:00.53 | AA+4.44s to AAA·+14.24s to Sectionals | 2025-12-07 | 2025 757swim Grand Illuminationvenue |
| 500 Freestyle | SCY | 5:41.65 | A+14.16s to AA·+54.26s to Sectionals | 2025-10-10 | 2025 757 Swim IMX/IMR Kickoff Meetvenue |
| 50 Backstroke | SCY | 26.81 | AAA+0.22s to AAAA·+3.12s to Futures | 2026-03-13 | 2026 Virginia Swimming SC Age Group Championsvenue |
| 100 Backstroke | SCY | 58.40 | AAA+2.61s to AAAA·+3.91s to Sectionals | 2026-03-14 | 2026 Virginia Swimming SC Age Group Championsvenue |
| 200 Backstroke | SCY | 2:23.76 | BB+4.77s to A·+25.17s to Sectionals | 2025-10-11 | 2025 757 Swim IMX/IMR Kickoff Meetvenue |
| 50 Breaststroke | SCY | 31.40 | AAA+1.01s to AAAA·+5.11s to Futures | 2025-12-06 | 2025 757swim Grand Illuminationvenue |
| 100 Breaststroke | SCY | 1:15.49 | BB+3.20s to A·+14.00s to Sectionals | 2025-11-09 | 2025 CGBD Carl Warner Classicvenue |
| 200 Breaststroke | SCY | 2:43.63 | BB+6.84s to A·+28.64s to Sectionals | 2025-10-12 | 2025 757 Swim IMX/IMR Kickoff Meetvenue |
| 50 Butterfly | SCY | 24.38 | AAAA·+1.49s to Futures | 2026-03-15 | 2026 Virginia Swimming SC Age Group Championsvenue |
| 100 Butterfly | SCY | 53.17 | AAAA·Sectionals ✓+2.58s to Futures | 2026-03-13 | 2026 Virginia Swimming SC Age Group Championsvenue |
| 200 Butterfly | SCY | 2:18.15 | A+2.36s to AA·+16.96s to Sectionals | 2025-12-05 | 2025 757swim Grand Illuminationvenue |
| 100 Individual Medley | SCY | 1:04.38 | 2025-10-26 | 2025 757swim Fall Fiestavenue | |
| 200 Individual Medley | SCY | 2:18.86 | A+3.57s to AA·+19.47s to Sectionals | 2025-10-10 | 2025 757 Swim IMX/IMR Kickoff Meetvenue |
| 400 Individual Medley | SCY | 4:59.62 | A+9.83s to AA·+44.53s to Sectionals | 2025-10-12 | 2025 757 Swim IMX/IMR Kickoff Meetvenue |
| 50 Freestyle | LCM | 25.52 | AAAA·+0.03s to Sectionals | 2026-08-01 | 2026 EZ LC Age Group Championshipfast pool |
| 100 Freestyle | LCM | 55.46 | AAAA·Sectionals ✓+1.87s to Futures | 2026-07-29 | 2026 EZ LC Age Group Championshipfast pool |
| 200 Freestyle | LCM | 2:22.56 | A+2.87s to AA·+21.27s to Sectionals | 2026-05-02 | 2026 TIDE Spring Shockwaveslow pool |
| 400 Freestyle | LCM | 5:54.21 | B+20.02s to BB·+96.62s to Sectionals | 2023-04-28 | 2023 TIDE Swimming Speedo Shockwave Meetslow pool |
| 50 Backstroke | LCM | 30.21 | AAAA·+2.32s to Futures | 2026-07-17 | 2026 Virginia Swimming LC Age Group Championsvenue |
| 100 Backstroke | LCM | 1:06.51 | AAA+0.92s to AAAA·+4.52s to Sectionals | 2026-07-18 | 2026 Virginia Swimming LC Age Group Championsvenue |
| 50 Breaststroke | LCM | 42.59 | BB+3.20s to A·+11.70s to Futures | 2024-06-01 | 2024 Virginia Commonwealth Gamesvenue |
| 50 Butterfly | LCM | 27.19 | AAAA·+0.90s to Futures | 2026-07-19 | 2026 Virginia Swimming LC Age Group Championsvenue |
| 100 Butterfly | LCM | 59.50 | AAAA·Sectionals ✓+1.51s to Futures | 2026-07-17 | 2026 Virginia Swimming LC Age Group Championsvenue |
| 200 Individual Medley | LCM | 2:42.87 | A+6.48s to AA·+26.68s to Sectionals | 2026-05-02 | 2026 TIDE Spring Shockwaveslow pool |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 13.
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 | 30.34 | flat | 200 Free Relay | 2022-12-03 | 2022 757SWIM Illumination Meet Dec 2-4 |
| 50 Freestyle | SCY | 16.70 | flying | 200 Free Relay (leg 2) | 2025-09-19 | 2025 757 Swim Battle of the Burg Intrasquad |
| 100 Freestyle | SCY | 1:05.89 | flat | 400 Free Relay | 2023-03-12 | 2023 Virginia Swimming SC Age Group Champions |
| 100 Freestyle | SCY | 50.16 | flying | 400 Free Relay (leg 4) | 2026-03-15 | 2026 Virginia Swimming SC Age Group Champions |
| 200 Freestyle | SCY | 1:55.87 | flying | 800 Free Relay (leg 2) | 2026-03-12 | 2026 Virginia Swimming SC Age Group Champions |
| 100 Backstroke | SCY | 1:12.17 | flat | 400 Medley Relay | 2023-03-10 | 2023 Virginia Swimming SC Age Group Champions |
| 50 Butterfly | SCY | 23.95 | flying | 200 Medley Relay (leg 3) | 2026-03-14 | 2026 Virginia Swimming SC Age Group Champions |
| 100 Butterfly | SCY | 56.14 | flying | 400 Medley Relay (leg 3) | 2026-03-13 | 2026 Virginia Swimming SC Age Group Champions |
| 50 Freestyle | LCM | 25.00 | flying | 200 Free Relay (leg 4) | 2026-07-18 | 2026 Virginia Swimming LC Age Group Champions |
| 100 Freestyle | LCM | 55.65 | flying | 400 Medley Relay (leg 4) | 2026-07-30 | 2026 EZ LC Age Group Championship |
| 100 Freestyle | LCM | 55.78 | flying | 400 Free Relay (leg 4) | 2026-07-19 | 2026 Virginia Swimming LC Age Group Champions |
| 200 Freestyle | LCM | 2:07.72 | flying | 800 Free Relay (leg 2) | 2026-07-16 | 2026 Virginia Swimming LC Age Group Champions |
| 50 Backstroke | LCM | 34.25 | flat | 200 Medley Relay | 2024-07-27 | 2024 VA LC Age Group Championships |
| 50 Butterfly | LCM | 26.11 | flying | 200 Medley Relay (leg 3) | 2026-07-18 | 2026 Virginia Swimming LC Age Group Champions |
| 100 Butterfly | LCM | 1:01.26 | flying | 400 Medley Relay (leg 3) | 2026-07-17 | 2026 Virginia Swimming LC Age Group Champions |
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 13-14 · SCY
3488 points (6/6 events)
| Event | Time | Points |
|---|---|---|
| 500 FR SCY | 5:41.65 | 607 |
| 200 BK SCY | 2:23.76 | 525 |
| 200 BR SCY | 2:43.63 | 515 |
| 200 FL SCY | 2:18.15 | 616 |
| 200 IM SCY | 2:18.86 | 621 |
| 400 IM SCY | 4:59.62 | 604 |
IMR 13-14 · SCY
3581 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 2:00.53 | 697 |
| 100 BK SCY | 58.40 | 768 |
| 100 BR SCY | 1:15.49 | 511 |
| 100 FL SCY | 53.17 | 984 |
| 200 IM SCY | 2:18.86 | 621 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
100 Freestyle SCY 49.90
Front half 23.80s · back half 26.10s
200 Freestyle SCY 2:00.53
Front half 56.24s · back half 64.29s
500 Freestyle SCY 5:41.65
Front half 167.09s · back half 174.56s
100 Backstroke SCY 58.40
Front half 27.95s · back half 30.45s
200 Backstroke SCY 2:23.76
Front half 71.08s · back half 72.68s
100 Breaststroke SCY 1:15.49
Front half 34.35s · back half 41.14s
200 Breaststroke SCY 2:43.63
Front half 80.16s · back half 83.47s
100 Butterfly SCY 53.17
Front half 24.31s · back half 28.86s
100 Individual Medley SCY 1:04.38
Front half 29.01s · back half 35.37s
200 Individual Medley SCY 2:18.86
Front half 64.45s · back half 74.41s
400 Individual Medley SCY 4:59.62
Front half 144.26s · back half 155.36s
100 Freestyle LCM 55.46 · 520.0 min after 100 Freestyle
Front half 26.72s · back half 28.74s
200 Freestyle LCM 2:22.56
Front half 68.00s · back half 74.56s
100 Backstroke LCM 1:06.51 RT 0.70s
Front half 31.28s · back half 35.23s
100 Butterfly LCM 59.50 RT 0.68s
Front half 27.91s · back half 31.59s
200 Individual Medley LCM 2:42.87
Front half 75.99s · back half 86.88s
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.