Swimmer profile

Mackenzie O'Brien

Female11-12Tollefson SwimmingPV · EASTERN

PerformanceProgressionGoalsTime StandardsMeets
Short-Course YardsLong-Course Meters
SeasonUSA Swimming season runs Sept – Aug
Event
2023–24
2024–25
2025–26
50 Free LCM
40.60
36.82
▲ 3.78
34.83
▲ 1.99
100 Free LCM
—
1:26.48
1:21.76
▲ 4.72
100 Back LCM
—
1:40.07
—
50 Breast LCM
—
44.69
41.23
▲ 3.46
100 Breast LCM
2:01.24
1:44.90
▲ 16.34
1:34.95
▲ 9.95
50 Fly LCM
—
44.03
41.15
▲ 2.88
200 IM LCM
—
—
3:14.76
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.

50 Free LCM34.83PB
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100 Free LCM1:21.76PB
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100 Back LCM1:40.07PB
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50 Breast LCM41.23PB
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100 Breast LCM1:34.95PB
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50 Fly LCM41.15PB
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200 IM LCM3:14.76PB
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