Swimmer profile
Declan Costello
Male15-16All Star AquaticsPV · EASTERN
SeasonUSA Swimming season runs Sept – Aug
Event
2019–20
2020–21
2021–22
2022–23
2023–24
2024–25
2025–26
50 Free SCY
35.96
33.69
▲ 2.27
30.94
▲ 2.75
28.35
▲ 2.59
26.45
▲ 1.90
25.01
▲ 1.44
23.08
▲ 1.93
100 Free SCY
1:28.07
1:14.46
▲ 13.61
1:07.35
▲ 7.11
1:01.68
▲ 5.67
57.03
▲ 4.65
54.09
▲ 2.94
49.64
▲ 4.45
200 Free SCY
3:20.93
—
2:27.49
▲ 53.44
2:16.28
▲ 11.21
2:04.26
▲ 12.02
1:57.79
▲ 6.47
1:46.91
▲ 10.88
500 Free SCY
—
—
6:30.18
5:57.24
▲ 32.94
5:26.73
▲ 30.51
5:15.16
▲ 11.57
4:47.03
▲ 28.13
1000 Free SCY
—
—
—
—
11:52.45
—
10:00.60
▲ 111.85
1650 Free SCY
—
—
—
—
19:27.20
—
16:41.26
▲ 165.94
50 Back SCY
—
38.28
39.99
▼ 1.71
33.55
▲ 6.44
—
28.76
▲ 4.79
—
100 Back SCY
—
—
1:23.34
1:11.94
▲ 11.40
1:05.58
▲ 6.36
1:02.37
▲ 3.21
1:00.78
▲ 1.59
200 Back SCY
—
—
—
2:38.06
2:18.76
▲ 19.30
2:14.50
▲ 4.26
2:08.45
▲ 6.05
50 Breast SCY
51.22
44.60
▲ 6.62
41.44
▲ 3.16
37.32
▲ 4.12
—
30.62
▲ 6.70
29.39
▲ 1.23
100 Breast SCY
1:48.76
1:40.41
▲ 8.35
1:33.17
▲ 7.24
1:30.35
▲ 2.82
1:14.41
▲ 15.94
1:06.38
▲ 8.03
1:04.66
▲ 1.72
200 Breast SCY
—
—
—
—
2:45.20
2:28.14
▲ 17.06
2:24.15
▲ 3.99
50 Fly SCY
—
42.43
39.92
▲ 2.51
36.27
▲ 3.65
—
—
—
100 Fly SCY
—
—
1:36.71
1:27.66
▲ 9.05
1:10.03
▲ 17.63
1:05.81
▲ 4.22
1:01.52
▲ 4.29
200 Fly SCY
—
—
—
—
2:38.66
2:22.82
▲ 15.84
—
100 IM SCY
1:43.60
1:25.46
▲ 18.14
1:23.10
▲ 2.36
1:14.74
▲ 8.36
—
1:00.83
▲ 13.91
—
200 IM SCY
—
—
2:55.69
2:44.41
▲ 11.28
2:21.12
▲ 23.29
2:10.21
▲ 10.91
2:03.33
▲ 6.88
400 IM SCY
—
—
—
—
5:02.70
4:34.72
▲ 27.98
4:23.47
▲ 11.25
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.