Swimmer profile
MJ Neilson
FemaleOpen / SeniorTucson Ford Dealers AquaticsAZ · WESTERNCollege athlete · University of ArizonaD1
SeasonUSA Swimming season runs Sept – Aug
Event
2015–16
2016–17
2017–18
2018–19
2019–20
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free LCM
33.48
30.98
▲ 2.50
29.54
▲ 1.44
28.80
▲ 0.74
—
28.34
▲ 0.46
27.61
▲ 0.73
27.13
▲ 0.48
27.04
▲ 0.09
27.28
▼ 0.24
27.82
▼ 0.54
100 Free LCM
1:15.79
1:08.92
▲ 6.87
1:04.79
▲ 4.13
1:01.86
▲ 2.93
1:05.59
▼ 3.73
59.96
▲ 5.63
59.54
▲ 0.42
59.25
▲ 0.29
58.55
▲ 0.70
1:00.43
▼ 1.88
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200 Free LCM
2:47.44
2:33.46
▲ 13.98
2:21.66
▲ 11.80
2:15.22
▲ 6.44
2:16.45
▼ 1.23
2:09.56
▲ 6.89
2:07.59
▲ 1.97
2:09.25
▼ 1.66
2:07.68
▲ 1.57
2:09.53
▼ 1.85
2:10.37
▼ 0.84
400 Free LCM
6:27.33
5:41.35
▲ 45.98
5:11.10
▲ 30.25
4:43.50
▲ 27.60
—
4:29.82
▲ 13.68
4:35.32
▼ 5.50
4:34.72
▲ 0.60
4:35.27
▼ 0.55
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800 Free LCM
—
—
—
10:40.45
—
9:37.07
▲ 63.38
—
9:33.63
▲ 3.44
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—
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1500 Free LCM
—
—
—
20:16.76
—
18:08.80
▲ 127.96
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—
—
—
—
50 Back LCM
43.49
39.81
▲ 3.68
35.25
▲ 4.56
36.84
▼ 1.59
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—
—
—
—
—
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100 Back LCM
1:37.11
1:23.99
▲ 13.12
1:17.43
▲ 6.56
1:13.65
▲ 3.78
—
1:13.12
▲ 0.53
—
1:11.84
▲ 1.28
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—
—
200 Back LCM
—
—
—
—
—
2:34.92
2:35.38
▼ 0.46
—
—
—
—
50 Breast LCM
42.60
40.16
▲ 2.44
37.35
▲ 2.81
37.52
▼ 0.17
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—
—
—
—
—
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100 Breast LCM
1:36.38
1:27.27
▲ 9.11
1:24.73
▲ 2.54
1:22.95
▲ 1.78
—
1:20.37
▲ 2.58
—
1:19.76
▲ 0.61
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—
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200 Breast LCM
—
—
—
3:01.56
—
2:59.25
▲ 2.31
3:02.62
▼ 3.37
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—
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50 Fly LCM
37.75
33.77
▲ 3.98
31.28
▲ 2.49
30.25
▲ 1.03
—
29.50
▲ 0.75
—
—
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28.45
▲ 1.05
28.23
▲ 0.22
100 Fly LCM
1:26.70
1:16.33
▲ 10.37
1:09.67
▲ 6.66
1:06.93
▲ 2.74
1:06.90
▲ 0.03
1:03.12
▲ 3.78
1:02.72
▲ 0.40
1:03.53
▼ 0.81
1:02.02
▲ 1.51
1:02.51
▼ 0.49
1:02.49
▲ 0.02
200 Fly LCM
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—
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2:25.20
2:26.59
▼ 1.39
2:19.39
▲ 7.20
2:19.84
▼ 0.45
2:20.48
▼ 0.64
2:19.29
▲ 1.19
2:20.26
▼ 0.97
2:21.38
▼ 1.12
200 IM LCM
3:09.33
2:46.36
▲ 22.97
2:36.56
▲ 9.80
2:32.78
▲ 3.78
2:34.56
▼ 1.78
2:26.53
▲ 8.03
2:27.79
▼ 1.26
2:28.27
▼ 0.48
2:29.18
▼ 0.91
2:31.13
▼ 1.95
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400 IM LCM
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5:50.14
5:29.35
▲ 20.79
5:25.77
▲ 3.58
5:12.60
▲ 13.17
5:19.65
▼ 7.05
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Improvement<0.5s0.5–2s2–5s5s+Slower
📊 All Attempts by Event
Chronological history of every recorded swim. Click an event to expand its attempt list.