Ethan Difronzo

Mage 18COIEMTMWNMSTUTCOFACUN

804 plausible swims · 124 meets · 2016-05-08 → 2025-08-03

Personal records

Event	Course	Best	Cut	Date	Meet
50 Freestyle	SCY	20.42	AAAA	2025-05-09	2025 CO OB CHSAA 4A State Championships venue
100 Freestyle	SCY	45.16	AAAA	2024-05-10	2024 CO OB CHSAA 5A Championships venue
200 Freestyle	SCY	1:40.22	AAAA	2025-03-28	2025 Four Corners Speedo Sectionals - Austin venue
500 Freestyle	SCY	4:50.00	AA+3.31s to AAA	2025-01-11	2025 CO NJ Pineapple Invitational fast pool
50 Backstroke	SCY	29.58	B+0.89s to BB	2020-01-18	2020 MW Midwest All Stars
100 Backstroke	SCY	53.10	AA+1.51s to AAA	2024-11-17	2024 CO TOPS Fall Invite venue
200 Backstroke	SCY	1:56.39	AA+2.90s to AAA	2023-03-25	2023 Four Corners Speedo Sectionals - Austin venue
50 Breaststroke	SCY	33.28	B+0.19s to BB	2019-11-23	2019 CO CUDA Pentathlon XXXII venue
100 Breaststroke	SCY	59.27	AA+0.38s to AAA	2025-02-22	2025 CO Colorado Senior Meet venue
200 Breaststroke	SCY	2:22.59	BB+3.00s to A	2023-01-15	2023 CO CUDA Classic venue
50 Butterfly	SCY	23.16	AAAA	2024-11-03	2024 CO ACES High Point Invite venue
100 Butterfly	SCY	50.93	AAA+1.74s to AAAA	2024-11-24	2024 CO CUDA Pentathlon XXXVII venue
200 Butterfly	SCY	2:05.58	A+4.39s to AA	2021-10-30	2021 CO LONG Great Pumpkin Pentathlon venue
100 Individual Medley	SCY	57.47		2021-10-23	2021 CO Loveland Autumn Open venue
200 Individual Medley	SCY	1:56.94	AA+0.75s to AAA	2025-01-10	2025 CO NJ Pineapple Invitational fast pool
400 Individual Medley	SCY	4:23.40	A+1.21s to AA	2024-02-10	2024 CO LOVE Sweetheart Last Chance venue
50 Freestyle	SCM	27.62	BB+1.43s to A	2020-09-12	2020 CO RIP vs FAC Dual venue
200 Freestyle	SCM	2:10.47	BB+3.48s to A	2020-09-12	2020 CO RIP vs FAC Dual venue
100 Breaststroke	SCM	1:17.84	B+0.95s to BB	2020-09-12	2020 CO RIP vs FAC Dual venue
50 Freestyle	LCM	23.32	AAAA	2024-06-29	2024 CO Zone 2 Meet - VMAC venue
100 Freestyle	LCM	52.79	AAA+0.10s to AAAA	2024-06-16	2024 CO CSI Long Course Open fast pool
200 Freestyle	LCM	1:59.38	AAA+4.19s to AAAA	2022-07-29	Finals - Western Zone Senior Champs fast pool
400 Freestyle	LCM	4:18.57	AA+1.28s to AAA	2022-07-28	Finals - Western Zone Senior Champs fast pool
800 Freestyle	LCM	9:26.38	A+3.09s to AA	2023-05-19	2023 CO ACES Spring Invite venue
50 Backstroke	LCM	29.47	AA+0.18s to AAA	2025-07-30	2025 Speedo Junior National Championships fast pool
100 Backstroke	LCM	1:04.49	A+0.30s to AA	2023-06-03	2023 CO CUDA Summer Sizzler venue
50 Breaststroke	LCM	31.46	AAA+0.77s to AAAA	2024-05-31	2024 CO Barracuda Summer Sizzler Invite venue
100 Breaststroke	LCM	1:11.94	A+0.35s to AA	2022-07-30	Finals - Western Zone Senior Champs fast pool
200 Breaststroke	LCM	2:46.49	BB+3.20s to A	2022-07-08	2022 CO Zone 2 District @VMAC venue
50 Butterfly	LCM	26.04	AAAA	2024-05-31	2024 CO Barracuda Summer Sizzler Invite venue
100 Butterfly	LCM	58.07	AAA+1.78s to AAAA	2024-06-14	2024 CO CSI Long Course Open fast pool
200 Individual Medley	LCM	2:17.72	AA+2.03s to AAA	2023-05-20	2023 CO ACES Spring Invite venue
400 Individual Medley	LCM	5:08.13	A+3.34s to AA	2022-06-04	2022 CO CUDA STAR Long Course Invitational venue

Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 18.

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	27.63	flat	200 Free Relay	2019-02-24	2019 CO CSI 14&U SC State Championships
50 Freestyle	SCY	21.43	flying	200 Medley Relay (leg 4)	2023-03-23	2023 Four Corners Speedo Sectionals - Austin
50 Freestyle	SCY	19.97	flying	200 Free Relay (leg 4)	2023-12-02	2023 CO CSI Pioneer Open
100 Freestyle	SCY	46.83	flying	400 Free Relay (leg 4)	2023-03-24	2023 Four Corners Speedo Sectionals - Austin
100 Freestyle	SCY	45.91	flying	400 Medley Relay (leg 4)	2023-03-26	2023 Four Corners Speedo Sectionals - Austin
200 Freestyle	SCY	1:42.74	flat	800 Free Relay	2023-03-25	2023 Four Corners Speedo Sectionals - Austin
200 Freestyle	SCY	1:44.74	flying	800 Free Relay (leg 4)	2022-03-26	2022 4C Speedo Sectionals - Austin
50 Breaststroke	SCY	31.67	flying	200 Medley Relay (leg 2)	2020-02-29	2020 CO CSI 14&U SC AG Championships
50 Butterfly	SCY	28.27	flying	200 Medley Relay (leg 3)	2019-12-06	2019 CO CSI Pioneer Open
50 Freestyle	LCM	24.11	flat	200 Free Relay	2025-07-23	USA Swimming Futures Sacramento 2025
50 Freestyle	LCM	30.55	flying	200 Free Relay (leg 3)	2019-06-21	2019 CO MAVS Grand Junction Invite
50 Freestyle	LCM	23.42	flying	200 Medley Relay (leg 4)	2025-07-23	USA Swimming Futures Sacramento 2025
100 Freestyle	LCM	53.49	flat	400 Free Relay	2025-07-25	USA Swimming Futures Sacramento 2025
100 Freestyle	LCM	53.78	flying	400 Medley Relay (leg 4)	2022-07-29	Finals - Western Zone Senior Champs
100 Freestyle	LCM	55.62	flying	400 Free Relay (leg 4)	2021-07-22	2021 CO CSI Senior LC State Championships
200 Freestyle	LCM	1:57.91	flying	800 Free Relay (leg 4)	2025-07-24	USA Swimming Futures Sacramento 2025
50 Breaststroke	LCM	45.37	flying	200 Medley Relay (leg 2)	2018-06-24	2018 CO MAVS Grand Junction Invite
100 Breaststroke	LCM	1:24.13	flying	400 Medley Relay (leg 2)	2022-06-30	2022 CO Grand Junction Invitational
50 Butterfly	LCM	34.48	flying	200 Medley Relay (leg 3)	2019-06-23	2019 CO MAVS Grand Junction Invite
100 Butterfly	LCM	1:02.36	flying	400 Medley Relay (leg 3)	2021-07-22	2021 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

4495 points (6/6 events)

Event	Time	Points
500 FR SCY	4:50.00	828
200 BK SCY	1:56.39	796
200 BR SCY	2:22.59	621
200 FL SCY	2:05.58	668
200 IM SCY	1:56.94	845
400 IM SCY	4:23.40	737

IMR 17-18 · SCY

4361 points (5/5 events)

Event	Time	Points
200 FR SCY	1:40.22	999
100 BK SCY	53.10	780
100 BR SCY	59.27	842
100 FL SCY	50.93	895
200 IM SCY	1:56.94	845

Scored against AAAA motivational base times: ordering is exact, absolute points run ~25% above the official USA Swimming scale.

PR splits

100 Freestyle SCY 45.16

21.64

23.52

Front half 21.64s · back half 23.52s

200 Freestyle SCY 1:40.22

22.98

24.90

25.88

26.46

Front half 47.88s · back half 52.34s

500 Freestyle SCY 4:50.00

25.46

28.48

29.89

29.79

29.60

29.47

29.89

29.93

29.59

27.90

Front half 143.22s · back half 146.78s

100 Backstroke SCY 53.10

25.77

27.33

Front half 25.77s · back half 27.33s

200 Backstroke SCY 1:56.39

27.29

29.36

30.14

29.60

Front half 56.65s · back half 59.74s

100 Breaststroke SCY 59.27

27.74

31.53

Front half 27.74s · back half 31.53s

200 Breaststroke SCY 2:22.59

31.10

35.83

37.55

38.11

Front half 66.93s · back half 75.66s

100 Butterfly SCY 50.93

23.54

27.39

Front half 23.54s · back half 27.39s

200 Butterfly SCY 2:05.58

27.57

31.36

32.95

33.70

Front half 58.93s · back half 66.65s

100 Individual Medley SCY 57.47

26.77

30.70

Front half 26.77s · back half 30.70s

200 Individual Medley SCY 1:56.94

24.46

31.33

34.39

26.76

Front half 55.79s · back half 61.15s

400 Individual Medley SCY 4:23.40

26.52

30.64

34.99

33.94

38.72

39.26

30.64

28.69

Front half 126.09s · back half 137.31s

200 Freestyle SCM 2:10.47

29.49

33.47

34.37

33.14

Front half 62.96s · back half 67.51s

100 Freestyle LCM 52.79

25.11

27.68

Front half 25.11s · back half 27.68s

200 Freestyle LCM 1:59.38

27.37

29.95

31.00

31.06

Front half 57.32s · back half 62.06s

400 Freestyle LCM 4:18.57

28.73

31.32

32.70

33.19

33.32

33.01

33.42

32.88

Front half 125.94s · back half 132.63s

800 Freestyle LCM 9:26.38

30.08

33.32

30.00

39.54

35.37

34.45

35.95

35.81

36.41

37.31

37.55

37.72

36.15

36.64

36.09

33.99

Front half 274.52s · back half 291.86s

100 Breaststroke LCM 1:11.94

33.60

38.34

Front half 33.60s · back half 38.34s

200 Breaststroke LCM 2:46.49

36.77

42.09

44.35

43.28

Front half 78.86s · back half 87.63s

100 Butterfly LCM 58.07

27.09

30.98

Front half 27.09s · back half 30.98s

200 Individual Medley LCM 2:17.72

64.29

73.43

Front half 64.29s · back half 73.43s

400 Individual Medley LCM 5:08.13

30.43

34.20

39.15

40.04

45.73

47.93

36.45

34.20

Front half 143.82s · back half 164.31s

Reaction time

fastest 0.62s average 0.659s slowest 0.70s 8 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 20.42 77 swims

100 Freestyle SCY 45.16 69 swims

200 Freestyle SCY 1:40.22 54 swims

500 Freestyle SCY 4:50.00 14 swims

50 Backstroke SCY 29.58 14 swims

100 Backstroke SCY 53.10 24 swims

200 Backstroke SCY 1:56.39 3 swims

50 Breaststroke SCY 33.28 11 swims

100 Breaststroke SCY 59.27 30 swims

200 Breaststroke SCY 2:22.59 8 swims

50 Butterfly SCY 23.16 20 swims

100 Butterfly SCY 50.93 41 swims

200 Butterfly SCY 2:05.58 2 swims

100 Individual Medley SCY 57.47 19 swims

200 Individual Medley SCY 1:56.94 31 swims

400 Individual Medley SCY 4:23.40 2 swims

50 Freestyle SCM 27.62 1 swim

200 Freestyle SCM 2:10.47 1 swim

100 Breaststroke SCM 1:17.84 1 swim

50 Freestyle LCM 23.32 61 swims

100 Freestyle LCM 52.79 58 swims

200 Freestyle LCM 1:59.38 47 swims

400 Freestyle LCM 4:18.57 26 swims

800 Freestyle LCM 9:26.38 3 swims

50 Backstroke LCM 29.47 18 swims

100 Backstroke LCM 1:04.49 27 swims

50 Breaststroke LCM 31.46 16 swims

100 Breaststroke LCM 1:11.94 24 swims

200 Breaststroke LCM 2:46.49 4 swims

50 Butterfly LCM 26.04 28 swims

100 Butterfly LCM 58.07 36 swims

200 Individual Medley LCM 2:17.72 32 swims

400 Individual Medley LCM 5:08.13 2 swims