Swimmer profile
Mackenzie O'Brien
Female15-16Mid-Michigan AquaticsMI · CENTRAL
SeasonUSA Swimming season runs Sept – Aug
Event
2016–17
2017–18
2018–19
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free LCM
50.96
41.09
▲ 9.87
41.99
▼ 0.90
37.16
▲ 4.83
34.08
▲ 3.08
33.21
▲ 0.87
30.47
▲ 2.74
28.28
▲ 2.19
27.92
▲ 0.36
100 Free LCM
1:56.88
1:38.05
▲ 18.83
1:30.57
▲ 7.48
1:19.10
▲ 11.47
1:13.81
▲ 5.29
1:11.31
▲ 2.50
1:07.85
▲ 3.46
1:02.18
▲ 5.67
1:00.80
▲ 1.38
200 Free LCM
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3:17.69
3:09.41
▲ 8.28
2:46.94
▲ 22.47
2:38.75
▲ 8.19
2:35.04
▲ 3.71
2:26.46
▲ 8.58
2:23.85
▲ 2.61
2:17.05
▲ 6.80
400 Free LCM
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—
6:23.80
5:35.56
▲ 48.24
5:26.01
▲ 9.55
5:18.68
▲ 7.33
5:10.07
▲ 8.61
5:08.44
▲ 1.63
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800 Free LCM
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—
—
—
11:12.04
10:46.53
▲ 25.51
10:49.76
▼ 3.23
10:43.63
▲ 6.13
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1500 Free LCM
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—
—
—
—
—
20:24.01
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50 Back LCM
1:00.29
52.47
▲ 7.82
45.78
▲ 6.69
40.80
▲ 4.98
39.28
▲ 1.52
37.53
▲ 1.75
36.39
▲ 1.14
32.65
▲ 3.74
31.86
▲ 0.79
100 Back LCM
2:05.05
1:53.71
▲ 11.34
1:39.82
▲ 13.89
1:27.21
▲ 12.61
1:22.71
▲ 4.50
1:19.39
▲ 3.32
1:17.07
▲ 2.32
1:10.05
▲ 7.02
1:08.17
▲ 1.88
200 Back LCM
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—
—
—
3:02.59
2:46.35
▲ 16.24
2:45.94
▲ 0.41
2:43.40
▲ 2.54
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50 Breast LCM
1:22.02
1:03.40
▲ 18.62
1:00.80
▲ 2.60
56.83
▲ 3.97
51.20
▲ 5.63
46.83
▲ 4.37
42.87
▲ 3.96
41.58
▲ 1.29
37.00
▲ 4.58
100 Breast LCM
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—
2:09.96
1:59.08
▲ 10.88
1:48.62
▲ 10.46
1:39.82
▲ 8.80
1:35.01
▲ 4.81
1:28.46
▲ 6.55
1:24.45
▲ 4.01
200 Breast LCM
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—
—
—
—
3:28.17
3:24.70
▲ 3.47
3:17.55
▲ 7.15
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50 Fly LCM
1:09.59
53.58
▲ 16.01
52.41
▲ 1.17
43.72
▲ 8.69
38.42
▲ 5.30
36.46
▲ 1.96
32.52
▲ 3.94
29.29
▲ 3.23
28.97
▲ 0.32
100 Fly LCM
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—
—
1:44.17
—
1:22.57
▲ 21.60
1:15.82
▲ 6.75
1:08.23
▲ 7.59
1:05.72
▲ 2.51
200 Fly LCM
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—
—
—
—
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2:44.51
2:41.13
▲ 3.38
200 IM LCM
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4:09.06
3:51.75
▲ 17.31
3:15.94
▲ 35.81
3:06.16
▲ 9.78
2:46.48
▲ 19.68
2:45.64
▲ 0.84
2:34.61
▲ 11.03
2:33.04
▲ 1.57
400 IM LCM
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—
—
—
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5:58.45
6:08.62
▼ 10.17
5:43.02
▲ 25.60
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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.