Swimmer profile
Mackenzie O'Brien
Female15-16Mid-Michigan AquaticsMI · CENTRAL
SeasonUSA Swimming season runs Sept – Aug
Event
2016–17
2017–18
2018–19
2019–20
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free SCY
49.74
42.37
▲ 7.37
38.39
▲ 3.98
35.48
▲ 2.91
32.24
▲ 3.24
29.32
▲ 2.92
27.93
▲ 1.39
27.58
▲ 0.35
25.12
▲ 2.46
24.08
▲ 1.04
100 Free SCY
—
1:33.05
1:23.05
▲ 10.00
1:17.52
▲ 5.53
1:06.87
▲ 10.65
1:02.16
▲ 4.71
1:00.59
▲ 1.57
59.53
▲ 1.06
54.37
▲ 5.16
53.02
▲ 1.35
200 Free SCY
—
3:03.68
2:47.70
▲ 15.98
2:40.88
▲ 6.82
2:27.27
▲ 13.61
2:22.07
▲ 5.20
2:12.94
▲ 9.13
2:08.16
▲ 4.78
2:00.47
▲ 7.69
1:58.70
▲ 1.77
500 Free SCY
—
8:24.35
7:35.63
▲ 48.72
6:48.19
▲ 47.44
6:15.62
▲ 32.57
6:06.04
▲ 9.58
5:53.31
▲ 12.73
—
5:36.69
▲ 16.62
5:31.01
▲ 5.68
1000 Free SCY
—
—
—
—
—
12:39.34
12:04.50
▲ 34.84
—
—
—
1650 Free SCY
—
—
—
—
—
—
20:09.29
—
20:07.22
▲ 2.07
—
50 Back SCY
1:02.86
44.72
▲ 18.14
41.87
▲ 2.85
39.43
▲ 2.44
35.07
▲ 4.36
34.04
▲ 1.03
33.82
▲ 0.22
—
29.16
▲ 4.66
27.37
▲ 1.79
100 Back SCY
—
1:36.77
1:28.62
▲ 8.15
1:23.78
▲ 4.84
1:16.51
▲ 7.27
1:13.45
▲ 3.06
1:11.63
▲ 1.82
1:08.82
▲ 2.81
1:01.95
▲ 6.87
59.13
▲ 2.82
200 Back SCY
—
—
—
—
—
2:29.87
2:27.32
▲ 2.55
2:27.72
▼ 0.40
2:17.71
▲ 10.01
2:11.14
▲ 6.57
50 Breast SCY
—
58.73
54.00
▲ 4.73
50.00
▲ 4.00
46.52
▲ 3.48
43.19
▲ 3.33
39.72
▲ 3.47
—
36.45
▲ 3.27
31.49
▲ 4.96
100 Breast SCY
—
2:08.33
1:55.55
▲ 12.78
1:46.32
▲ 9.23
1:38.88
▲ 7.44
1:33.51
▲ 5.37
1:31.04
▲ 2.47
—
1:13.89
▲ 17.15
1:10.88
▲ 3.01
200 Breast SCY
—
—
—
—
—
—
3:03.01
—
2:47.58
▲ 15.43
2:35.54
▲ 12.04
50 Fly SCY
—
47.60
43.33
▲ 4.27
39.81
▲ 3.52
37.83
▲ 1.98
33.96
▲ 3.87
30.89
▲ 3.07
30.04
▲ 0.85
26.82
▲ 3.22
25.98
▲ 0.84
100 Fly SCY
—
—
—
1:44.91
—
—
1:12.93
▲ 31.98
1:11.27
▲ 1.66
1:01.66
▲ 9.61
57.25
▲ 4.41
200 Fly SCY
—
—
—
—
—
—
—
—
2:31.32
2:17.22
▲ 14.10
100 IM SCY
—
1:47.70
1:37.51
▲ 10.19
1:24.06
▲ 13.45
1:22.47
▲ 1.59
1:20.86
▲ 1.61
1:11.77
▲ 9.09
1:09.01
▲ 2.76
1:01.21
▲ 7.80
59.25
▲ 1.96
200 IM SCY
—
3:47.83
—
2:58.63
▲ 49.20
2:47.91
▲ 10.72
2:47.03
▲ 0.88
2:35.16
▲ 11.87
2:29.10
▲ 6.06
2:21.21
▲ 7.89
2:10.00
▲ 11.21
400 IM SCY
—
—
—
—
—
—
5:20.96
—
4:58.06
▲ 22.90
4:47.97
▲ 10.09
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.