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Mackenzie O'Brien

FemalePVTollefson Swimming

Also swam for Unattached (2025). Best times below include every one of them.

18 events·81 swims·18 meets·Last raced May 31, 2026

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Best Times

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100 Breast

BBBAAAAAAAAAA2.33 to AA

1:20.92

2026-04-01

BBBAAAAAAAAAA0.96 to A

1:34.95

2026-05-30

50 Breast

BBBAAAAAAAAAA1.03 to AA

37.22

2026-03-01

BBBAAAAAAAAAA1.78 to AA

42.67

2026-05-31

200 Breast

BBBAAAAAAAAAA12.55 to A

3:08.84

2025-10-11

200 IM

BBBAAAAAAAAAA11.29 to A

2:48.88

2026-04-04

BBBAAAAAAAAAA14.17 to A

3:14.76

2026-05-29

100 IM

BBBAAAAAAAAAA4.23 to A

1:17.32

2026-04-02

50 Free

BBBAAAAAAAAAA1.58 to A

30.87

2026-03-01

BBBAAAAAAAAAA1.64 to A

34.83

2026-04-25

100 Free

BBBAAAAAAAAAA0.27 to BB

1:09.66

2026-04-03

BBBAAAAAAAAAA2.27 to BB

1:21.76

2026-05-31

50 Fly

BBBAAAAAAAAAA0.27 to BB

34.56

2026-04-03

BBBAAAAAAAAAA2.36 to BB

41.15

2026-05-31

50 Back

BBBAAAAAAAAAA1.19 to BB

37.18

2026-04-01

200 Free

BBBAAAAAAAAAA10.70 to BB

2:41.59

2026-03-01

100 Back

BBBAAAAAAAAAA7.38 to BB

1:40.07

2025-06-22

100 Fly

BBBAAAAAAAAAA8.95 to B

1:34.74

2026-01-17

Explore

USA Swimming time standards — 11-12 Girls

See how Mackenzie's times rank nationally: 100 Breast 50 Breast 200 Breast 200 IM 100 IM 50 Free