swimWilliam O'Brien
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 25 Freestyle | SCY | 11.39 | 2025-12-27 | 2025 CO ACES Sprint Eliminator 1-3venue | |
| 50 Freestyle | SCY | 23.21 | A+0.52s to AA·+0.02s to Sectionals | 2025-01-01 | 2025 CO CSI Pioneer Open |
| 100 Freestyle | SCY | 50.62 | A+0.73s to AA·Sectionals ✓+4.23s to Futures | 2025-02-23 | 2025 CO Colorado Senior Meetvenue |
| 200 Freestyle | SCY | 1:55.09 | BB+0.20s to A·+3.30s to Sectionals | 2024-11-02 | 2024 CO TOPS Denver Invitationalvenue |
| 500 Freestyle | SCY | 5:52.44 | B+13.65s to BB·+49.75s to Sectionals | 2025-01-25 | 2025 CO TOPS Colorado Openvenue |
| 50 Backstroke | SCY | 34.69 | +3.80s to B·+11.00s to Futures | 2020-03-07 | 2020 CO CSI 14&U Silver Statevenue |
| 100 Backstroke | SCY | 55.48 | A+1.59s to AA·Sectionals ✓+3.99s to Futures | 2025-01-01 | 2025 CO CSI Pioneer Open |
| 200 Backstroke | SCY | 2:04.15 | BB+0.36s to A·+2.86s to Sectionals | 2024-02-18 | 2024 CO CSI Senior Meetvenue |
| 50 Breaststroke | SCY | 45.75 | +10.16s to B·+19.46s to Futures | 2020-02-15 | 2020 CO Jeffco February Finaleslow pool |
| 100 Breaststroke | SCY | 1:02.86 | A+1.27s to AA·Sectionals ✓+4.87s to Futures | 2025-02-22 | 2025 CO Colorado Senior Meetvenue |
| 200 Breaststroke | SCY | 2:25.24 | BB+5.65s to A·+7.95s to Sectionals | 2025-02-23 | 2025 CO Colorado Senior Meetvenue |
| 25 Butterfly | SCY | 10.95 | 2025-12-27 | 2025 CO ACES Sprint Eliminator 1-3venue | |
| 50 Butterfly | SCY | 24.33 | AA+0.04s to AAA·+1.44s to Futures | 2025-12-27 | 2025 CO ACES Sprint Eliminator 1-3venue |
| 100 Butterfly | SCY | 53.68 | AA+2.09s to AAA·Sectionals ✓+3.09s to Futures | 2025-01-01 | 2025 CO CSI Pioneer Open |
| 200 Butterfly | SCY | 2:29.17 | +1.68s to B·+25.78s to Sectionals | 2024-01-20 | 2024 CO TOPS Colorado Openvenue |
| 100 Individual Medley | SCY | 1:01.79 | 2024-09-21 | 2024 CO TOPS & FST Pentathlonvenue | |
| 200 Individual Medley | SCY | 2:05.42 | A+3.93s to AA·+1.43s to Sectionals | 2024-05-03 | 2024 CO OB Centennial A League Championshipvenue |
| 400 Individual Medley | SCY | 4:54.41 | BB+20.82s to A·+29.72s to Sectionals | 2025-01-26 | 2025 CO TOPS Colorado Openvenue |
| 50 Freestyle | LCM | 26.30 | A+0.01s to AA·Sectionals ✓+1.71s to Futures | 2025-07-30 | GROUP B tt - WZ LCM Senior Champs 2025fast pool |
| 100 Freestyle | LCM | 59.41 | A+1.72s to AA·+0.42s to Sectionals | 2024-06-16 | 2024 CO CSI Long Course Openvenue |
| 200 Freestyle | LCM | 2:21.34 | BB+9.75s to A·+12.65s to Sectionals | 2024-06-29 | 2024 CO Zone 2 - Uvenue |
| 400 Freestyle | LCM | 5:04.66 | B+0.67s to BB·+30.27s to Sectionals | 2024-06-28 | 2024 CO Zone 2 - Uvenue |
| 50 Backstroke | LCM | 30.15 | AA+0.86s to AAA·+2.26s to Futures | 2025-07-18 | 2025 CO CSI Senior LC State Championshipsvenue |
| 100 Backstroke | LCM | 1:06.11 | A+1.92s to AA·+0.92s to Sectionals | 2025-08-01 | WZ LCM Senior Champs 2025fast pool |
| 200 Backstroke | LCM | 2:31.32 | BB+5.43s to A·+9.83s to Sectionals | 2023-07-23 | 2023 CO CSI Senior LC State Championshipsvenue |
| 50 Breaststroke | LCM | 36.66 | BB+1.57s to A·+5.77s to Futures | 2025-07-20 | 2025 CO CSI Senior LC State Championshipsvenue |
| 100 Breaststroke | LCM | 1:17.04 | BB+2.35s to A·+3.34s to Sectionals | 2025-07-29 | WZ LCM Senior Champs 2025fast pool |
| 200 Breaststroke | LCM | 2:53.23 | BB+9.94s to A·+12.35s to Sectionals | 2024-06-14 | 2024 CO CSI Long Course Openvenue |
| 50 Butterfly | LCM | 37.50 | +2.71s to B·+11.21s to Futures | 2022-04-10 | 2022 CO HRA Suburban League Pentathlonslow pool |
| 100 Butterfly | LCM | 1:05.31 | BB+1.02s to A·+2.22s to Sectionals | 2025-07-31 | WZ LCM Senior Champs 2025fast pool |
| 200 Individual Medley | LCM | 2:33.41 | BB+5.32s to A·+8.72s to Sectionals | 2025-07-20 | 2025 CO CSI Senior LC State Championshipsvenue |
Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 18.
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 | 31.92 | flat | 200 Free Relay | 2020-01-26 | 2020 CO TOPS Colorado Open |
| 50 Freestyle | SCY | 23.17 | flying | 200 Free Relay (leg 2) | 2025-12-27 | 2025 CO ACES Sprint Eliminator 1-3 |
| 100 Freestyle | SCY | 52.34 | flat | 400 Free Relay | 2024-11-03 | 2024 CO TOPS Denver Invitational |
| 100 Freestyle | SCY | 32.49 | flying | 400 Free Relay (leg 4) | 2022-01-23 | 2022 CO TOPS Colorado Open |
| 50 Backstroke | SCY | 26.84 | flat | 200 Medley Relay | 2024-11-02 | 2024 CO TOPS Denver Invitational |
| 100 Backstroke | SCY | 59.52 | flat | 400 Medley Relay | 2025-01-25 | 2025 CO TOPS Colorado Open |
| 50 Freestyle | LCM | 27.29 | flying | 200 Free Relay (leg 4) | 2025-01-04 | 2025 CO TOPS Long Course Invite |
| 50 Freestyle | LCM | 27.55 | flying | 200 Medley Relay (leg 4) | 2024-01-06 | 2024 CO TOPS Long Course Invite |
| 50 Backstroke | LCM | 31.87 | flat | 200 Medley Relay | 2025-01-04 | 2025 CO TOPS Long Course Invite |
| 100 Backstroke | LCM | 1:10.54 | flat | 400 Medley Relay | 2023-07-20 | 2023 CO CSI Senior LC State 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 17-18 · SCY
3316 points (6/6 events)
| Event | Time | Points |
|---|---|---|
| 500 FR SCY | 5:52.44 | 461 |
| 200 BK SCY | 2:04.15 | 656 |
| 200 BR SCY | 2:25.24 | 588 |
| 200 FL SCY | 2:29.17 | 398 |
| 200 IM SCY | 2:05.42 | 685 |
| 400 IM SCY | 4:54.41 | 528 |
IMR 17-18 · SCY
3498 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 1:55.09 | 659 |
| 100 BK SCY | 55.48 | 684 |
| 100 BR SCY | 1:02.86 | 706 |
| 100 FL SCY | 53.68 | 764 |
| 200 IM SCY | 2:05.42 | 685 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
100 Freestyle SCY 50.62
Front half 24.28s · back half 26.34s
200 Freestyle SCY 1:55.09
Front half 54.93s · back half 60.16s
500 Freestyle SCY 5:52.44
Front half 172.78s · back half 179.66s
200 Backstroke SCY 2:04.15
Front half 60.54s · back half 63.61s
100 Breaststroke SCY 1:02.86
Front half 29.53s · back half 33.33s
200 Breaststroke SCY 2:25.24
Front half 69.48s · back half 75.76s
50 Butterfly SCY 24.33
Front half 11.17s · back half 13.16s
200 Butterfly SCY 2:29.17
Front half 68.87s · back half 80.30s
100 Individual Medley SCY 1:01.79
Front half 28.76s · back half 33.03s
200 Individual Medley SCY 2:05.42
Front half 57.87s · back half 67.55s
400 Individual Medley SCY 4:54.41
Front half 144.44s · back half 149.97s
100 Freestyle LCM 59.41
Front half 28.70s · back half 30.71s
200 Freestyle LCM 2:21.34
Front half 66.30s · back half 75.04s
400 Freestyle LCM 5:04.66
Front half 153.30s · back half 151.36s
200 Backstroke LCM 2:31.32
Front half 73.21s · back half 78.11s
200 Breaststroke LCM 2:53.23
Front half 83.80s · back half 89.43s
100 Butterfly LCM 1:05.31
Front half 29.26s · back half 36.05s
200 Individual Medley LCM 2:33.41
Front half 72.29s · back half 81.12s
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.