Mackenzie Shields

Fage 17CTEZMENEABFBGSCGSCNYCYPPSCUNUN-01

725 plausible swims · 112 meets · 1996-01-13 → 2026-06-28

Personal records

Event	Course	Best	Cut	Date	Meet
25 Freestyle	SCY	17.10		2018-06-23	2018 ME LRSC Summer Sprint Meet venue
50 Freestyle	SCY	25.73	AA+0.74s to AAA	2026-03-14	2026 NE INST NE Cup fast pool
100 Freestyle	SCY	54.36	AA+0.27s to AAA	2026-03-15	2026 NE INST NE Cup fast pool
200 Freestyle	SCY	1:55.33	AAA+3.64s to AAAA	2026-03-13	2026 NE INST NE Cup fast pool
500 Freestyle	SCY	5:01.91	AAA+0.62s to AAAA	2026-03-28	2026 EZ SCY Sectional Meet venue
1000 Freestyle	SCY	10:22.98	AAAA	2026-03-26	2026 EZ SCY Sectional Meet venue
1650 Freestyle	SCY	17:23.93	AAAA	2026-03-29	2026 EZ SCY Sectional Meet venue
25 Backstroke	SCY	19.88		2019-06-23	2019 ME LRSC Sprint Meet - Approved venue
50 Backstroke	SCY	38.69	+3.50s to B	2019-03-23	2019 ME Winter Championships fast pool
100 Backstroke	SCY	58.83	AA+0.34s to AAA	2026-03-28	2026 EZ SCY Sectional Meet venue
200 Backstroke	SCY	2:07.26	AA+0.27s to AAA	2024-12-21	2024 NE CS SCY New England Senior Meet venue
25 Breaststroke	SCY	20.02		2019-06-23	2019 ME LRSC Sprint Meet - Approved venue
50 Breaststroke	SCY	33.38	AA+1.19s to AAA	2025-03-09	2025 NE GS NE Cup Championship venue
100 Breaststroke	SCY	1:10.94	A+0.65s to AA	2026-03-15	2026 NE INST NE Cup fast pool
200 Breaststroke	SCY	2:33.48	AA+6.69s to AAA	2026-03-14	2026 NE INST NE Cup fast pool
25 Butterfly	SCY	26.81		2017-07-09	2017 ME SEAL Summery SYOA slow pool
50 Butterfly	SCY	28.65	A+0.06s to AA	2025-03-08	2025 NE GS NE Cup Championship venue
100 Butterfly	SCY	1:03.45	A+2.56s to AA	2025-03-08	2025 NE GS NE Cup Championship venue
200 Butterfly	SCY	2:20.80	A+5.21s to AA	2025-03-09	2025 NE GS NE Cup Championship venue
100 Individual Medley	SCY	1:11.61		2021-11-07	2021 ME Andrew Selsikar Meet
200 Individual Medley	SCY	1:59.22	AAAA	2026-01-01	2026 ne inst abf jan results
400 Individual Medley	SCY	4:38.83	AA+0.64s to AAA	2026-03-27	2026 EZ SCY Sectional Meet venue
50 Freestyle	LCM	29.11	AA+0.72s to AAA	2025-01-01	2025 ne sac america s cup results
100 Freestyle	LCM	1:02.71	AA+1.22s to AAA	2025-07-26	2025 NE CRA July LC P/Fand Specialty Meet venue
200 Freestyle	LCM	2:13.68	AA+0.59s to AAA	2025-07-27	2025 NE CRA July LC P/Fand Specialty Meet venue
400 Freestyle	LCM	4:38.38	AAA+10.09s to AAAA	2026-06-27	2026 NE YNS June Prelims Finals Meet venue
800 Freestyle	LCM	9:35.39	AAA+19.40s to AAAA	2025-01-01	2025 NE Swimming LC Senior Championships - Brown University, S#: NE25-0710CS venue
1500 Freestyle	LCM	18:24.50	AAA+44.11s to AAAA	2026-06-26	2026 NE YNS June Prelims Finals Meet venue
50 Backstroke	LCM	34.39	A+0.40s to AA	2023-07-15	2023 ME LCM CHAMPS venue
100 Backstroke	LCM	1:09.14	AA+0.75s to AAA	2025-03-29	2025 Speedo Sectional Championship venue
200 Backstroke	LCM	2:29.53	AA+1.34s to AAA	2025-03-30	2025 Speedo Sectional Championship venue
50 Breaststroke	LCM	49.83	+3.54s to B	2019-07-27	2019 ME Maine Swimming International Invite slow pool
100 Breaststroke	LCM	1:27.78	BB+3.59s to A	2025-03-27	2025 Speedo Sectional Championship
200 Breaststroke	LCM	3:10.13	BB+7.54s to A	2023-01-01	Gator Swimming Seekonk Spring Fling
50 Butterfly	LCM	33.63	BB+0.24s to A	2026-05-10	2026 NE CRA MIT Team Specialty LC Meet venue
100 Butterfly	LCM	1:15.09	BB+2.80s to A	2024-07-26	2024 NE NSSC LCM Silvers Champs
200 Individual Medley	LCM	2:33.58	AA+3.69s to AAA	2026-06-27	2026 NE YNS June Prelims Finals Meet venue
400 Individual Medley	LCM	5:26.29	AA+8.20s to AAA	2025-01-01	2025 NE Swimming LC Senior Championships - Brown University, S#: NE25-0710CS venue

Cuts are USA Swimming single-age motivational standards (B → AAAA) at age 17.

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	26.15	flat	200 Free Relay	2025-03-08	2025 NE GS NE Cup Championship
50 Freestyle	SCY	25.84	flying	200 Free Relay (leg 3)	2025-03-01	2025 NE CRIM 15-18 AG Championships
50 Freestyle	SCY	34.31	flying	200 Medley Relay (leg 4)	2018-12-08	2018 ME BASA Bowdoin Open
100 Freestyle	SCY	56.11	flat	400 Free Relay	2025-02-28	2025 NE CRIM 15-18 AG Championships
100 Freestyle	SCY	59.35	flying	400 Free Relay (leg 2)	2022-12-11	2022 ME BASA Bowdoin Open
100 Freestyle	SCY	59.02	flying	400 Medley Relay (leg 4)	2022-12-10	2022 ME BASA Bowdoin Open
50 Backstroke	SCY	40.83	flat	200 Medley Relay	2019-03-23	2019 ME Winter Championships
50 Butterfly	SCY	34.85	flying	200 Medley Relay (leg 3)	2021-05-02	2021 ME Winter Champs
50 Freestyle	LCM	31.22	flat	200 Free Relay	2023-07-14	2023 ME LCM CHAMPS
50 Freestyle	LCM	39.29	flying	200 Free Relay (leg 3)	2022-07-17	2022 ME SUMMER LCM CHAMPS
100 Freestyle	LCM	1:05.09	flat	400 Free Relay	2023-07-15	2023 ME LCM CHAMPS
100 Freestyle	LCM	1:07.17	flying	400 Free Relay (leg 3)	2022-07-15	2022 ME SUMMER LCM CHAMPS
200 Freestyle	LCM	2:16.00	flying	800 Free Relay (leg 2)	2025-07-11	2025 NE CS LCM Senior Championships
50 Backstroke	LCM	36.81	flat	200 Medley Relay	2023-07-16	2023 ME LCM 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

5087 points (6/6 events)

Event	Time	Points
500 FR SCY	5:01.91	955
200 BK SCY	2:07.26	819
200 BR SCY	2:33.48	734
200 FL SCY	2:20.80	651
200 IM SCY	1:59.22	1089
400 IM SCY	4:38.83	839

IMR 17-18 · SCY

4159 points (5/5 events)

Event	Time	Points
200 FR SCY	1:55.33	876
100 BK SCY	58.83	816
100 BR SCY	1:10.94	720
100 FL SCY	1:03.45	658
200 IM SCY	1:59.22	1089

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

PR splits

100 Freestyle SCY 54.36

26.61

27.75

Front half 26.61s · back half 27.75s

200 Freestyle SCY 1:55.33

26.97

29.27

29.70

29.39

Front half 56.24s · back half 59.09s

500 Freestyle SCY 5:01.91

27.69

29.70

30.47

31.17

30.71

30.84

30.95

30.68

30.32

29.38

Front half 149.74s · back half 152.17s

1000 Freestyle SCY 10:22.98

28.18

30.77

30.81

30.76

30.94

31.29

31.21

30.96

31.37

31.39

31.04

31.38

31.51

31.72

31.79

31.85

31.99

31.79

31.73

30.50

Front half 307.68s · back half 315.30s

1650 Freestyle SCY 17:23.93

28.11

30.64

31.19

31.48

31.64

31.60

31.72

31.79

31.91

32.09

31.44

31.54

31.94

32.22

32.55

31.95

31.99

31.89

31.74

31.70

32.27

32.46

31.94

32.31

31.72

31.81

32.01

32.22

31.41

31.29

31.20

30.27

100 Backstroke SCY 58.83

28.65

30.18

Front half 28.65s · back half 30.18s

200 Backstroke SCY 2:07.26

29.93

31.53

32.90

Front half 61.46s · back half 65.80s

100 Breaststroke SCY 1:10.94

33.46

37.48

Front half 33.46s · back half 37.48s

200 Breaststroke SCY 2:33.48

34.80

39.08

39.72

39.88

Front half 73.88s · back half 79.60s

100 Butterfly SCY 1:03.45

30.06

33.39

Front half 30.06s · back half 33.39s

200 Butterfly SCY 2:20.80

30.53

35.69

37.16

37.42

Front half 66.22s · back half 74.58s

100 Individual Medley SCY 1:11.61 split/total mismatch

33.14

5.33

Front half 33.14s · back half 38.47s

200 Individual Medley SCY 1:59.22 split/total mismatch

27.68

30.05

30.81

30.68

400 Individual Medley SCY 4:38.83

30.06

35.89

34.15

34.60

40.53

41.48

31.91

30.21

Front half 134.70s · back half 144.13s

100 Freestyle LCM 1:02.71

30.24

32.47

Front half 30.24s · back half 32.47s

200 Freestyle LCM 2:13.68

31.39

34.09

33.92

34.28

Front half 65.48s · back half 68.20s

400 Freestyle LCM 4:38.38

31.41

34.51

35.60

35.98

35.43

35.91

35.52

34.02

Front half 137.50s · back half 140.88s

800 Freestyle LCM 9:35.39 split/total mismatch

36.02

36.88

36.02

36.56

36.39

36.85

36.58

37.15

36.80

36.64

36.66

36.92

35.44

33.56

1500 Freestyle LCM 18:24.50

32.85

36.04

36.29

36.73

29.00

44.44

35.14

36.62

36.76

37.28

30.64

42.71

33.98

40.02

37.53

37.75

37.34

38.25

37.48

37.90

36.60

37.71

37.24

37.81

37.52

37.45

36.87

37.10

32.00

39.45

Front half 546.03s · back half 558.47s

200 Backstroke LCM 2:29.53

34.62

38.10

38.01

38.80

Front half 72.72s · back half 76.81s

200 Breaststroke LCM 3:10.13 split/total mismatch

43.14

4.85

1.20

0.62

Front half 47.99s · back half 142.14s

100 Butterfly LCM 1:15.09 split/total mismatch

34.63

5.83

Front half 34.63s · back half 40.46s

200 Individual Medley LCM 2:33.58

34.78

38.84

45.78

34.18

Front half 73.62s · back half 79.96s

400 Individual Medley LCM 5:26.29 split/total mismatch

33.72

42.63

40.28

40.63

48.54

49.16

36.19

35.14

Reaction time

fastest 0.68s average 0.688s slowest 0.70s 4 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.

25 Freestyle SCY 17.10 5 swims

50 Freestyle SCY 25.73 45 swims

100 Freestyle SCY 54.36 36 swims

200 Freestyle SCY 1:55.33 50 swims

500 Freestyle SCY 5:01.91 41 swims

1000 Freestyle SCY 10:22.98 14 swims

1650 Freestyle SCY 17:23.93 18 swims

25 Backstroke SCY 19.88 3 swims

50 Backstroke SCY 38.69 17 swims

100 Backstroke SCY 58.83 45 swims

200 Backstroke SCY 2:07.26 38 swims

25 Breaststroke SCY 20.02 6 swims

50 Breaststroke SCY 33.38 20 swims

100 Breaststroke SCY 1:10.94 27 swims

200 Breaststroke SCY 2:33.48 14 swims

25 Butterfly SCY 26.81 3 swims

50 Butterfly SCY 28.65 19 swims

100 Butterfly SCY 1:03.45 24 swims

200 Butterfly SCY 2:20.80 9 swims

100 Individual Medley SCY 1:11.61 15 swims

200 Individual Medley SCY 1:59.22 45 swims

400 Individual Medley SCY 4:38.83 31 swims

50 Freestyle LCM 29.11 11 swims

100 Freestyle LCM 1:02.71 19 swims

200 Freestyle LCM 2:13.68 22 swims

400 Freestyle LCM 4:38.38 22 swims

800 Freestyle LCM 9:35.39 7 swims

1500 Freestyle LCM 18:24.50 9 swims

50 Backstroke LCM 34.39 3 swims

100 Backstroke LCM 1:09.14 26 swims

200 Backstroke LCM 2:29.53 19 swims

50 Breaststroke LCM 49.83 1 swim

100 Breaststroke LCM 1:27.78 6 swims

200 Breaststroke LCM 3:10.13 3 swims

50 Butterfly LCM 33.63 1 swim

100 Butterfly LCM 1:15.09 6 swims

200 Individual Medley LCM 2:33.58 25 swims

400 Individual Medley LCM 5:26.29 20 swims