Swimmer profile
Mason Kostov
Male15-16Asphalt Green Unified AquaticsMR · EASTERN
SeasonUSA Swimming season runs Sept – Aug
Event
2017–18
2018–19
2019–20
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free SCY
38.76
37.53
▲ 1.23
33.34
▲ 4.19
31.74
▲ 1.60
26.55
▲ 5.19
23.49
▲ 3.06
22.45
▲ 1.04
21.74
▲ 0.71
21.85
▼ 0.11
100 Free SCY
1:29.15
—
1:14.97
▲ 14.18
—
1:00.62
▲ 14.35
52.63
▲ 7.99
49.92
▲ 2.71
48.77
▲ 1.15
48.98
▼ 0.21
200 Free SCY
—
—
—
—
2:11.73
2:00.75
▲ 10.98
1:54.80
▲ 5.95
1:53.50
▲ 1.30
1:54.37
▼ 0.87
500 Free SCY
—
—
—
—
6:00.29
5:30.14
▲ 30.15
5:14.01
▲ 16.13
5:31.76
▼ 17.75
5:12.75
▲ 19.01
1000 Free SCY
—
—
—
—
—
—
11:08.46
10:48.06
▲ 20.40
—
50 Back SCY
44.79
46.25
▼ 1.46
39.26
▲ 6.99
36.45
▲ 2.81
30.78
▲ 5.67
28.76
▲ 2.02
—
—
—
100 Back SCY
—
—
1:28.37
—
1:09.26
▲ 19.11
1:02.44
▲ 6.82
1:00.48
▲ 1.96
1:01.73
▼ 1.25
59.68
▲ 2.05
200 Back SCY
—
—
—
—
2:29.77
—
2:15.05
▲ 14.72
2:20.00
▼ 4.95
—
50 Breast SCY
55.25
—
50.41
▲ 4.84
—
37.01
▲ 13.40
30.63
▲ 6.38
29.50
▲ 1.13
—
—
100 Breast SCY
—
—
1:43.95
—
1:26.61
▲ 17.34
1:08.50
▲ 18.11
1:05.40
▲ 3.10
1:05.95
▼ 0.55
1:06.32
▼ 0.37
200 Breast SCY
—
—
—
—
—
—
2:32.17
2:34.01
▼ 1.84
—
50 Fly SCY
52.29
—
41.33
▲ 10.96
—
33.50
▲ 7.83
27.00
▲ 6.50
26.84
▲ 0.16
—
25.54
▲ 1.30
100 Fly SCY
—
—
—
1:38.73
1:21.76
▲ 16.97
1:02.73
▲ 19.03
58.65
▲ 4.08
58.03
▲ 0.62
56.98
▲ 1.05
200 Fly SCY
—
—
—
—
—
—
2:17.71
—
2:17.35
▲ 0.36
100 IM SCY
1:48.89
1:33.54
▲ 15.35
1:26.24
▲ 7.30
—
1:11.04
▲ 15.20
1:00.63
▲ 10.41
58.66
▲ 1.97
—
58.46
▲ 0.20
200 IM SCY
—
—
—
—
2:33.82
2:12.96
▲ 20.86
2:07.00
▲ 5.96
2:10.92
▼ 3.92
2:10.35
▲ 0.57
400 IM SCY
—
—
—
—
—
—
—
4:54.21
—
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.