Knox O'Brien

Mage 13EZVA757

287 plausible swims · 39 meets · 2022-06-17 → 2026-05-17

Personal records

Event	Course	Best	Cut	Date	Meet
50 Freestyle	SCY	23.03	AAAA	2026-03-14	2026 Virginia Swimming SC Age Group Champions venue
100 Freestyle	SCY	49.90	AAAA	2026-03-15	2026 Virginia Swimming SC Age Group Champions venue
200 Freestyle	SCY	2:00.53	AA+4.44s to AAA	2025-12-07	2025 757swim Grand Illumination venue
500 Freestyle	SCY	5:41.65	A+14.16s to AA	2025-10-10	2025 757 Swim IMX/IMR Kickoff Meet venue
50 Backstroke	SCY	26.81	AAA+0.22s to AAAA	2026-03-13	2026 Virginia Swimming SC Age Group Champions venue
100 Backstroke	SCY	58.40	AAA+2.61s to AAAA	2026-03-14	2026 Virginia Swimming SC Age Group Champions venue
200 Backstroke	SCY	2:23.76	BB+4.77s to A	2025-10-11	2025 757 Swim IMX/IMR Kickoff Meet venue
50 Breaststroke	SCY	31.40	AAA+1.01s to AAAA	2025-12-06	2025 757swim Grand Illumination venue
100 Breaststroke	SCY	1:15.49	BB+3.20s to A	2025-11-09	2025 CGBD Carl Warner Classic venue
200 Breaststroke	SCY	2:43.63	BB+6.84s to A	2025-10-12	2025 757 Swim IMX/IMR Kickoff Meet venue
50 Butterfly	SCY	24.38	AAAA	2026-03-15	2026 Virginia Swimming SC Age Group Champions venue
100 Butterfly	SCY	53.17	AAAA	2026-03-13	2026 Virginia Swimming SC Age Group Champions venue
200 Butterfly	SCY	2:18.15	A+2.36s to AA	2025-12-05	2025 757swim Grand Illumination venue
100 Individual Medley	SCY	1:04.38		2025-10-25	2025 757swim Fall Fiesta
200 Individual Medley	SCY	2:18.86	A+3.57s to AA	2025-10-10	2025 757 Swim IMX/IMR Kickoff Meet venue
400 Individual Medley	SCY	4:59.62	A+9.83s to AA	2025-10-12	2025 757 Swim IMX/IMR Kickoff Meet venue
50 Freestyle	LCM	26.16	AAAA	2026-05-16	2026 EZ LC Speedo Super Sectionals venue
100 Freestyle	LCM	57.23	AAAA	2026-05-14	2026 EZ LC Speedo Super Sectionals venue
200 Freestyle	LCM	2:22.56	A+2.87s to AA	2026-05-01	2026 TIDE Spring Shockwave
400 Freestyle	LCM	5:54.21	B+20.02s to BB	2023-04-28	2023 TIDE Swimming Speedo Shockwave Meet slow pool
50 Backstroke	LCM	30.55	AAAA	2026-05-14	2026 EZ LC Speedo Super Sectionals venue
100 Backstroke	LCM	1:08.76	AA+0.07s to AAA	2026-05-16	2026 EZ LC Speedo Super Sectionals venue
50 Breaststroke	LCM	42.59	BB+3.20s to A	2024-06-01	2024 Virginia Commonwealth Games venue
50 Butterfly	LCM	27.66	AAAA	2026-05-17	2026 EZ LC Speedo Super Sectionals venue
100 Butterfly	LCM	1:01.79	AAAA	2026-05-15	2026 EZ LC Speedo Super Sectionals venue
200 Individual Medley	LCM	2:42.87	A+6.48s to AA	2026-05-01	2026 TIDE Spring Shockwave

Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 13.

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	29.10	flying	200 Free Relay (leg 2)	2023-03-11	2023 Virginia Swimming SC Age Group Champions
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
100 Backstroke	SCY	1:12.17	flat	400 Medley Relay	2023-03-10	2023 Virginia Swimming SC Age Group Champions
50 Butterfly	SCY	30.46	flying	200 Medley Relay (leg 3)	2023-03-11	2023 Virginia Swimming SC Age Group Champions
50 Freestyle	LCM	30.17	flying	200 Free Relay (leg 2)	2024-06-01	2024 Virginia Commonwealth Games
100 Freestyle	LCM	1:08.19	flying	400 Free Relay (leg 2)	2024-07-28	2024 VA LC Age Group Championships
50 Backstroke	LCM	34.25	flat	200 Medley Relay	2024-07-27	2024 VA LC Age Group Championships
50 Butterfly	LCM	32.90	flying	200 Medley Relay (leg 3)	2024-05-04	BASS Jim Frye Memorial Invitational May 202
100 Butterfly	LCM	1:18.37	flying	400 Medley Relay (leg 3)	2024-07-26	2024 VA LC Age Group 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 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

23.80

26.10

Front half 23.80s · back half 26.10s

200 Freestyle SCY 2:00.53

25.87

30.37

32.24

32.05

Front half 56.24s · back half 64.29s

500 Freestyle SCY 5:41.65

28.93

33.66

34.76

34.65

35.09

35.43

35.71

35.17

35.21

33.04

Front half 167.09s · back half 174.56s

100 Backstroke SCY 58.40

27.95

30.45

Front half 27.95s · back half 30.45s

200 Backstroke SCY 2:23.76

33.18

37.90

37.87

34.81

Front half 71.08s · back half 72.68s

100 Breaststroke SCY 1:15.49

34.35

41.14

Front half 34.35s · back half 41.14s

200 Breaststroke SCY 2:43.63

36.59

43.57

44.12

39.35

Front half 80.16s · back half 83.47s

100 Butterfly SCY 53.17

24.31

28.86

Front half 24.31s · back half 28.86s

200 Individual Medley SCY 2:18.86

28.47

35.98

43.23

31.18

Front half 64.45s · back half 74.41s

400 Individual Medley SCY 4:59.62

31.01

36.99

37.77

38.49

45.67

46.24

34.00

29.45

Front half 144.26s · back half 155.36s

Reaction time

fastest 0.60s average 0.669s slowest 0.72s 15 electronic starts

Start reaction over time faster starts higher

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.

Progression

Faster times are higher. One card per event, all courses & history.

50 Freestyle SCY 23.03 22 swims

100 Freestyle SCY 49.90 19 swims

200 Freestyle SCY 2:00.53 13 swims

500 Freestyle SCY 5:41.65 3 swims

50 Backstroke SCY 26.81 21 swims

100 Backstroke SCY 58.40 21 swims

200 Backstroke SCY 2:23.76 1 swim

50 Breaststroke SCY 31.40 4 swims

100 Breaststroke SCY 1:15.49 5 swims

200 Breaststroke SCY 2:43.63 1 swim

50 Butterfly SCY 24.38 17 swims

100 Butterfly SCY 53.17 13 swims

200 Butterfly SCY 2:18.15 5 swims

100 Individual Medley SCY 1:04.38 16 swims

200 Individual Medley SCY 2:18.86 9 swims

400 Individual Medley SCY 4:59.62 1 swim

50 Freestyle LCM 26.16 18 swims

100 Freestyle LCM 57.23 15 swims

200 Freestyle LCM 2:22.56 6 swims

400 Freestyle LCM 5:54.21 1 swim

50 Backstroke LCM 30.55 14 swims

100 Backstroke LCM 1:08.76 15 swims

50 Breaststroke LCM 42.59 4 swims

50 Butterfly LCM 27.66 16 swims

100 Butterfly LCM 1:01.79 16 swims

200 Individual Medley LCM 2:42.87 11 swims