swimCillian O'Brien
Personal records
| Event | Course | Best | Cut | Date | Meet |
|---|---|---|---|---|---|
| 25 Freestyle | SCY | 20.40 | 2026-01-01 | full resultsregion xcel(2) | |
| 50 Freestyle | SCY | 23.74 | A+0.65s to AA·+1.35s to Sectionals | 2026-01-31 | 2026 ASC Senior Meetvenue |
| 100 Freestyle | SCY | 50.72 | A+0.33s to AA·+2.23s to Sectionals | 2026-02-01 | 2026 ASC Senior Meetvenue |
| 200 Freestyle | SCY | 1:54.22 | A+3.03s to AA·+7.93s to Sectionals | 2026-02-20 | 2026 Speedo MD LSC Senior Champsvenue |
| 500 Freestyle | SCY | 5:08.33 | A+6.64s to AA·+20.94s to Sectionals | 2025-11-02 | 2025 Fox Fall Invitational 2venue |
| 1000 Freestyle | SCY | 10:55.45 | A+23.46s to AA·+55.96s to Sectionals | 2024-11-09 | 2024 FSC & EST Distance Dual |
| 1650 Freestyle | SCY | 17:58.43 | A+22.74s to AA·+74.44s to Sectionals | 2024-11-09 | 2024 FSC & EST Distance Dual |
| 25 Backstroke | SCY | 24.39 | 2026-01-01 | full resultsregion xcel(2) | |
| 50 Backstroke | SCY | 25.96 | A+0.27s to AA·+2.27s to Futures | 2025-12-21 | 2025 FOX Winter Clean Up Meet |
| 100 Backstroke | SCY | 55.40 | A+0.51s to AA·+0.91s to Sectionals | 2026-02-21 | 2026 Speedo MD LSC Senior Champsvenue |
| 200 Backstroke | SCY | 1:59.00 | AA+4.21s to AAA·+0.41s to Sectionals | 2025-11-02 | 2025 Fox Fall Invitational 2venue |
| 25 Breaststroke | SCY | 30.54 | 2026-01-01 | full resultsregion xcel(2) | |
| 50 Breaststroke | SCY | 33.35 | BB+2.46s to A·+7.06s to Futures | 2025-01-12 | 2025 FOX January Distance & Sprint Meetvenue |
| 100 Breaststroke | SCY | 1:11.49 | B+1.40s to BB·+10.00s to Sectionals | 2025-10-18 | 2025 Fox Fall Invitational 1 - copiedvenue |
| 200 Breaststroke | SCY | 2:42.38 | B+9.89s to BB·+27.39s to Sectionals | 2024-11-03 | 2024 Fox Fall Invitational 2venue |
| 25 Butterfly | SCY | 27.81 | 2026-01-01 | full resultsregion xcel(2) | |
| 50 Butterfly | SCY | 27.71 | BB+1.02s to A·+4.82s to Futures | 2023-11-05 | 2023 Fox Fall Invitational 2venue |
| 100 Butterfly | SCY | 57.69 | BB+1.00s to A·+4.50s to Sectionals | 2025-10-18 | 2025 Fox Fall Invitational 1 - copiedvenue |
| 200 Butterfly | SCY | 2:12.21 | BB+4.72s to A·+11.02s to Sectionals | 2025-11-01 | 2025 Fox Fall Invitational 2venue |
| 100 Individual Medley | SCY | 59.48 | 2026-02-01 | 2026 ASC Senior Meetvenue | |
| 200 Individual Medley | SCY | 2:09.47 | BB+1.28s to A·+10.08s to Sectionals | 2025-10-19 | 2025 Fox Fall Invitational 1 - copiedvenue |
| 400 Individual Medley | SCY | 4:37.94 | BB+1.95s to A·+22.85s to Sectionals | 2025-11-01 | 2025 Fox Fall Invitational 2venue |
| 50 Freestyle | LCM | 28.59 | BB+0.80s to A·+3.10s to Sectionals | 2024-04-14 | 2024 Fox April Long Course Invitationalvenue |
| 100 Freestyle | LCM | 1:02.52 | BB+1.93s to A·+7.03s to Sectionals | 2024-04-13 | 2024 Fox April Long Course Invitationalvenue |
| 200 Freestyle | LCM | 2:19.99 | BB+6.70s to A·+18.70s to Sectionals | 2024-04-14 | 2024 Fox April Long Course Invitationalvenue |
| 50 Backstroke | LCM | 31.36 | A+0.67s to AA·+3.47s to Futures | 2024-04-13 | 2024 Fox April Long Course Invitationalvenue |
| 100 Backstroke | LCM | 1:08.25 | BB+0.76s to A·+6.26s to Sectionals | 2024-04-14 | 2024 Fox April Long Course Invitationalvenue |
| 200 Backstroke | LCM | 2:32.71 | BB+5.62s to A·+17.92s to Sectionals | 2024-04-13 | 2024 Fox April Long Course Invitationalvenue |
| 50 Breaststroke | LCM | 39.88 | B+1.89s to BB·+8.99s to Futures | 2024-04-14 | 2024 Fox April Long Course Invitationalvenue |
| 100 Breaststroke | LCM | 2:23.69 | +55.60s to B·+74.00s to Sectionals | 2018-04-21 | 2018 All American Swim LC Spring Classic |
| 200 Breaststroke | LCM | 3:19.14 | +6.95s to B·+46.55s to Sectionals | 2024-01-14 | 2024 Fox Winter Long Course Challenge |
| 50 Butterfly | LCM | 31.46 | BB+1.27s to A·+5.17s to Futures | 2024-04-13 | 2024 Fox April Long Course Invitationalvenue |
| 100 Butterfly | LCM | 1:11.45 | B+0.86s to BB·+11.26s to Sectionals | 2024-01-14 | 2024 Fox Winter Long Course Challenge |
| 200 Individual Medley | LCM | 2:47.24 | B+6.35s to BB·+31.05s to Sectionals | 2023-04-15 | 2023 FOX April Long Course Invitationalvenue |
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.
Fastest relay legs
| Leg | Course | Time | Start | Relay | Date | Meet |
|---|---|---|---|---|---|---|
| 50 Freestyle | SCY | 21.13 | flying | 200 Medley Relay (leg 4) | 2023-10-22 | 2023 Fox Fall Invitational 1 |
| 50 Freestyle | SCY | 22.50 | flying | 200 Free Relay (leg 3) | 2025-10-18 | 2025 Fox Fall Invitational 1 - copied |
| 100 Freestyle | SCY | 50.58 | flying | 400 Free Relay (leg 3) | 2026-02-22 | 2026 Speedo MD LSC Senior Champs |
| 50 Backstroke | SCY | 26.69 | flat | 200 Medley Relay | 2025-10-19 | 2025 Fox Fall Invitational 1 - copied |
| 100 Backstroke | SCY | 54.69 | flat | 400 Medley Relay | 2026-02-20 | 2026 Speedo MD LSC Senior Champs |
| 100 Butterfly | SCY | 1:07.22 | flying | 400 Medley Relay (leg 3) | 2022-12-09 | 2022 11th HOKI Swim and Tri Winter 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 · SCY
3676 points (6/6 events)
| Event | Time | Points |
|---|---|---|
| 500 FR SCY | 5:08.33 | 689 |
| 200 BK SCY | 1:59.00 | 745 |
| 200 BR SCY | 2:42.38 | 420 |
| 200 FL SCY | 2:12.21 | 572 |
| 200 IM SCY | 2:09.47 | 623 |
| 400 IM SCY | 4:37.94 | 627 |
IMR 17-18 · SCY
3080 points (5/5 events)
| Event | Time | Points |
|---|---|---|
| 200 FR SCY | 1:54.22 | 674 |
| 100 BK SCY | 55.40 | 687 |
| 100 BR SCY | 1:11.49 | 480 |
| 100 FL SCY | 57.69 | 616 |
| 200 IM SCY | 2:09.47 | 623 |
Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.
PR splits
100 Freestyle SCY 50.72
Front half 24.16s · back half 26.56s
200 Freestyle SCY 1:54.22
Front half 53.25s · back half 60.97s
500 Freestyle SCY 5:08.33
100 Backstroke SCY 55.40
Front half 27.07s · back half 28.33s
200 Backstroke SCY 1:59.00
Front half 57.65s · back half 61.35s
100 Breaststroke SCY 1:11.49
Front half 33.67s · back half 37.82s
200 Breaststroke SCY 2:42.38
Front half 76.93s · back half 85.45s
100 Butterfly SCY 57.69
Front half 26.96s · back half 30.73s
200 Butterfly SCY 2:12.21
Front half 59.74s · back half 72.47s
100 Individual Medley SCY 59.48
Front half 25.93s · back half 33.55s
200 Individual Medley SCY 2:09.47
Front half 57.79s · back half 71.68s
400 Individual Medley SCY 4:37.94
Front half 129.41s · back half 148.53s
100 Freestyle LCM 1:02.52
Front half 29.40s · back half 33.12s
200 Freestyle LCM 2:19.99
Front half 65.61s · back half 74.38s
100 Backstroke LCM 1:08.25
Front half 33.31s · back half 34.94s
200 Backstroke LCM 2:32.71
Front half 72.33s · back half 80.38s
200 Individual Medley LCM 2:47.24
Front half 75.21s · back half 92.03s
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.