Swimmer profile
Brennen Oneil
MaleOpen / SeniorFASTCO · WESTERN
SeasonUSA Swimming season runs Sept – Aug
Event
2015–16
2016–17
2017–18
2018–19
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free LCM
39.52
34.97
▲ 4.55
33.09
▲ 1.88
31.32
▲ 1.77
27.13
▲ 4.19
26.19
▲ 0.94
—
25.40
▲ 0.79
—
24.84
▲ 0.56
100 Free LCM
1:29.05
1:13.07
▲ 15.98
1:11.17
▲ 1.90
1:06.75
▲ 4.42
1:00.38
▲ 6.37
56.69
▲ 3.69
1:00.58
▼ 3.89
54.73
▲ 5.85
—
54.33
▲ 0.40
200 Free LCM
3:11.33
2:43.47
▲ 27.86
2:28.74
▲ 14.73
2:22.50
▲ 6.24
2:08.63
▲ 13.87
2:03.32
▲ 5.31
—
1:58.42
▲ 4.90
—
1:57.66
▲ 0.76
400 Free LCM
—
5:26.32
5:08.68
▲ 17.64
4:57.45
▲ 11.23
4:26.39
▲ 31.06
4:17.34
▲ 9.05
4:15.83
▲ 1.51
4:09.58
▲ 6.25
—
4:23.05
▼ 13.47
800 Free LCM
—
—
10:49.16
10:27.94
▲ 21.22
—
8:49.54
▲ 98.40
8:48.58
▲ 0.96
8:43.15
▲ 5.43
—
8:40.50
▲ 2.65
1500 Free LCM
—
—
21:09.10
—
17:38.26
▲ 210.84
16:31.73
▲ 66.53
16:32.03
▼ 0.30
16:20.57
▲ 11.46
—
16:52.03
▼ 31.46
50 Back LCM
47.95
42.33
▲ 5.62
41.10
▲ 1.23
39.34
▲ 1.76
—
29.44
▲ 9.90
—
27.80
▲ 1.64
26.85
▲ 0.95
27.45
▼ 0.60
100 Back LCM
1:45.42
1:29.99
▲ 15.43
1:23.56
▲ 6.43
1:19.05
▲ 4.51
—
1:02.12
▲ 16.93
59.52
▲ 2.60
58.62
▲ 0.90
56.88
▲ 1.74
57.02
▼ 0.14
200 Back LCM
—
—
2:52.72
2:52.22
▲ 0.50
—
2:12.14
▲ 40.08
2:11.63
▲ 0.51
2:05.48
▲ 6.15
2:06.89
▼ 1.41
2:05.86
▲ 1.03
50 Breast LCM
56.33
51.66
▲ 4.67
48.77
▲ 2.89
—
—
—
34.00
▲ 14.77
32.09
▲ 1.91
31.96
▲ 0.13
—
100 Breast LCM
2:02.04
1:52.58
▲ 9.46
—
1:41.35
▲ 11.23
—
1:13.93
▲ 27.42
—
1:10.78
▲ 3.15
1:09.64
▲ 1.14
1:10.83
▼ 1.19
200 Breast LCM
—
—
—
—
—
2:41.14
2:41.85
▼ 0.71
2:25.88
▲ 15.97
2:24.22
▲ 1.66
2:29.90
▼ 5.68
50 Fly LCM
59.48
43.51
▲ 15.97
37.75
▲ 5.76
32.53
▲ 5.22
—
28.56
▲ 3.97
—
27.21
▲ 1.35
26.70
▲ 0.51
—
100 Fly LCM
—
1:48.91
1:31.22
▲ 17.69
1:13.70
▲ 17.52
1:05.49
▲ 8.21
1:01.67
▲ 3.82
1:00.41
▲ 1.26
57.66
▲ 2.75
—
58.34
▼ 0.68
200 Fly LCM
—
—
—
2:42.94
2:25.53
▲ 17.41
2:19.94
▲ 5.59
2:22.16
▼ 2.22
—
—
—
200 IM LCM
4:06.39
3:07.63
▲ 58.76
2:58.68
▲ 8.95
2:43.30
▲ 15.38
2:19.85
▲ 23.45
2:12.69
▲ 7.16
2:09.62
▲ 3.07
2:05.35
▲ 4.27
2:06.46
▼ 1.11
2:05.62
▲ 0.84
400 IM LCM
—
—
—
5:44.93
4:54.98
▲ 49.95
4:41.47
▲ 13.51
4:37.97
▲ 3.50
4:33.11
▲ 4.86
4:30.25
▲ 2.86
4:32.26
▼ 2.01
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.