Swimmer profile
Nina Mazereeuw
Female17-18Charles River AquaticsNE · EASTERN
SeasonUSA Swimming season runs Sept – Aug
Event
2018–19
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free LCM
39.91
—
30.25
▲ 9.66
28.44
▲ 1.81
27.98
▲ 0.46
27.98
± 0.00
28.22
▼ 0.24
100 Free LCM
1:20.34
1:07.67
▲ 12.67
1:02.96
▲ 4.71
1:01.40
▲ 1.56
59.68
▲ 1.72
59.19
▲ 0.49
1:00.37
▼ 1.18
200 Free LCM
2:59.39
2:26.05
▲ 33.34
2:16.93
▲ 9.12
2:13.01
▲ 3.92
2:10.51
▲ 2.50
2:09.91
▲ 0.60
2:12.23
▼ 2.32
400 Free LCM
6:29.82
5:23.73
▲ 66.09
5:08.93
▲ 14.80
4:46.83
▲ 22.10
4:46.88
▼ 0.05
4:38.50
▲ 8.38
4:50.54
▼ 12.04
800 Free LCM
—
—
—
—
10:02.64
9:41.89
▲ 20.75
—
1500 Free LCM
—
—
—
—
19:26.25
—
—
50 Back LCM
45.85
—
—
—
—
33.19
▲ 12.66
—
100 Back LCM
1:42.07
1:27.06
▲ 15.01
—
1:12.72
▲ 14.34
1:15.05
▼ 2.33
1:10.17
▲ 4.88
—
200 Back LCM
—
—
—
2:35.48
2:45.33
▼ 9.85
—
—
50 Breast LCM
49.22
41.28
▲ 7.94
—
—
—
—
—
100 Breast LCM
1:45.88
1:30.81
▲ 15.07
1:34.01
▼ 3.20
1:26.73
▲ 7.28
1:24.34
▲ 2.39
1:30.64
▼ 6.30
—
200 Breast LCM
—
3:16.19
3:07.57
▲ 8.62
—
3:09.75
▼ 2.18
—
—
50 Fly LCM
50.15
35.48
▲ 14.67
—
—
—
29.66
▲ 5.82
29.69
▼ 0.03
100 Fly LCM
1:47.25
—
—
1:10.01
▲ 37.24
1:10.14
▼ 0.13
1:06.24
▲ 3.90
1:08.14
▼ 1.90
200 Fly LCM
—
—
2:39.67
2:48.82
▼ 9.15
2:48.61
▲ 0.21
2:38.95
▲ 9.66
2:47.00
▼ 8.05
200 IM LCM
3:26.31
2:49.21
▲ 37.10
2:33.63
▲ 15.58
2:31.62
▲ 2.01
2:34.12
▼ 2.50
2:31.43
▲ 2.69
2:36.22
▼ 4.79
400 IM LCM
—
—
5:32.49
5:32.59
▼ 0.10
5:36.32
▼ 3.73
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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.