Mayumi So

Also swam for YMCA of Rock River Valley Stingrays (2025), Unattached (2025). Best times below include every one of them.

★ Team Record — 100 Back LCM (1:31.03)★ Team Record — 50 Fly LCM (39.82)★ Team Record — 100 Fly LCM (1:33.27)

23 events136 swims30 meetsLast raced Jul 26, 2026

Where Mayumi ranks

Current best: each age group's best time, against the swimmers in it now.

50 Breast SCY39.92

FastestField

Girls 10 & Under · best in age group · set Jul 2026Tap a row for the list

Cuts Checker

Include conversions

Select a time standard above to see which events you qualify for.

Best Times

Show conversions

100 Fly

SCY10 swims

BBBAAAAAAAAAA1.83 to AAA

#8 IL#244 USA

BEST

1:17.82

2026-07-18

LCM5 swims

BBBAAAAAAAAAA1.08 to AA

#98 Central#416 USA

1:33.27

2026-07-26

50 Breast

SCY14 swims

BBBAAAAAAAAAA1.03 to AAA

#239 USA#1 RMSC

39.92

2026-07-19

LCM6 swims

BBBAAAAAAAAAA1.45 to AAA

#286 USA#1 RMSC

45.74

2026-07-25

50 Fly

SCY17 swims

BBBAAAAAAAAAA1.39 to AAA

#490 USA#1 RMSC

34.58

2026-07-19

LCM6 swims

BBBAAAAAAAAAA0.33 to AA

#152 Central#633 USA

39.82

2026-07-25

100 Breast

SCY14 swims

BBBAAAAAAAAAA3.91 to AAA

#60 Central#309 USA

BEST

1:28.60

2026-07-18

LCM6 swims

BBBAAAAAAAAAA4.86 to AAA

#76 Central#426 USA

1:42.95

2026-07-26

100 Back

SCY3 swims

BBBAAAAAAAAAA1.73 to AA

#146 Central#617 USA

BEST

1:20.12

2026-07-19

LCM5 swims

BBBAAAAAAAAAA0.94 to AA

#143 Central#609 USA

1:31.03

2026-07-25

200 IM

SCY3 swims

BBBAAAAAAAAAA6.86 to AA

#118 Central#548 USA

BEST

2:54.55

2026-07-18

LCM2 swims

BBBAAAAAAAAAA8.80 to AA

#32 IL#831 USA

3:21.89

2026-06-12

500 Free

SCY1 swim

BBBAAAAAAAAAA15.37 to BB

#334 Central#1,407 USA

8:00.46

2025-07-18

LCM1 swim

BBBAAAAAAAAAA13.76 to A

#126 Central#592 USA

BEST

6:28.65

2026-06-06

200 Free

SCY2 swims

BBBAAAAAAAAAA13.55 to A

#527 Central#2,062 USA

2:51.94

2025-10-26

LCM2 swims

BBBAAAAAAAAAA4.99 to A

#303 Central#1,337 USA

BEST

3:05.38

2026-05-17

50 Back

SCY10 swims

BBBAAAAAAAAAA1.29 to A

#1,821 USA#3 RMSC

39.28

2026-07-18

LCM4 swims

BBBAAAAAAAAAA0.03 to A

#286 Central#1,150 USA

43.62

2026-06-06

100 IM

SCY6 swims

BBBAAAAAAAAAA5.45 to A

#458 Central#2,146 USA

1:27.54

2026-01-10

100 Free

SCY5 swims

BBBAAAAAAAAAA4.79 to A

#516 Central#2,095 USA

BEST

1:16.28

2026-02-15

LCM2 swims

BBBAAAAAAAAAA6.22 to BB

#1,329 Central#5,557 USA

1:39.21

2025-07-11

50 Free

SCY8 swims

BBBAAAAAAAAAA2.42 to A

#755 Central#3,015 USA

34.51

2026-02-15

LCM4 swims

BBBAAAAAAAAAA1.94 to A

#560 Central#2,285 USA

BEST

38.53

2026-06-07

Open Mayumi's full profile in the app

Race-day alerts, every cut, every PB drop, and the full meet plan — on iPhone and Android.

Explore

USA Swimming time standards — 10 & Under Girls

See how Mayumi's times rank nationally: 100 Fly 50 Breast 50 Breast (LCM)50 Fly 100 Breast 100 Breast (LCM)

Other Rockford Marlins Swim Club swimmers around Mayumi's age: Violet Daehler Emma Mueller Aubrey Macnider Paige Gordon