2025 East Bay Silver Dolphins Short Course C/B/BB+
- September 13-14, 2025
- Hercules Swim Center, Hercules, California
- Short Course Yards (25 yards), timed finals
- Full Meet Results
In his last meet as an 11-12, Ayden Tan from San Ramon Valley Aquatics in California took down one last National Age Group Record before aging up. This time, he broke the 100 backstroke record that was set by another California Ronald Dalmacio in 2016.
Tan posted a 50.76, which undercut Dalmacio’s prior mark of 50.99. Tan’s previous best of 51.11 ranked him 2nd all-time in the age group. That swim was done in January of this year.
No splits were available for Tan’s latest swim.
Fastest 11-12s in US history, 100 SCY Backstroke
- Ayden Tan, SRVA – 50.76 (2025)
- Ronald Dalmacio, Rose Bowl Aquatics – 50.99 (2016)
- Vinny Marciano, Morris County Swim Club – 51.40 (2014)
- Ethan Wang, Unattached – 51.63 (2025)
- Brett Freyerick, NCAP – 51.95 (2016)
Tan, who swims for San Ramon Valley Aquatics, has been on a record-breaking streak this summer. He also broke the 100 yard IM record in Rohnert Park, California in mid-June, the 200 meter IM record in early July, the 100 meter free record in July in Santa Rosa, the 50 meter fly and 200 meter IM records in July, and the 50 meter free record in early August. This gives him seven total 11-12 National Age Group Record swims in summer 2025, which add to his five National Age Group Records in the 10 & under age group from 2023.
Tan swam several other best times at the meet. That includes a 21.76 in the 50 yard free that makes him the second-fastest 11-12 in history behind only U.S. Olympian Thomas Heilman (21.50) and just the 5th 11-12 ever under 22 seconds in the event.
All-Time Rankings, Boys’ 11-12 50 SCY Freestyle
- Thomas Heilman, Piedmont Family YMCA/CYAC – 21.50 (2019)
- Ayden Tan, SRVA – 21.76 (2025)
- Vinny Marciano, Morris County Swim Club – 21.78 (2014)
- Michael Andrew, Unattached – 21.85 (2011)
- Ronald Dalmacio, Rose Bowl Aquatics – 21.86 (2017)
Tan also swam 23.88 in the 50 back to rank 2nd all-time in the age group (behind Dalmacio’s 23.65) and 48.49 in the 100 free to rank 8th all-time in the age group. All four of those times were personal bests, team records, and LSC records.
His final swim was a 52.22 in the 100 fly, which was about six-tenths shy of his lifetime best.
This kid can walk on water!
https://www.instagram.com/p/DOrp3dUgeg7/?utm_source=ig_web_button_share_sheet&igsh=MWpyanUwbnpqcXl3Yg==
Ronald Dalmacio,
Vinny Marciano,
Ethan Wang,
Brett Freyerick,
More proof that being breaking NAG records at 11-12 yo doesn’t guarantee you to be a great swimmer at 20 yo
Ok negative Nancy,
Proof that it can be a great indicator:
Thomas Heilman
Michael Andrew
Missy Franklin
Amanda Weir
Regan Smith
Alex Walsh
Claire Curzan
Ryan Murphy
Michael Phelps
Katie Ledecky
Carson Foster
Don’t want to argue against my side, but none of those 4 have an 11-12 yo NAG. Uphold the rigor Braden, you are the admin!
They don’t now, but they all did (except Ledecky).
Carson famously broke Phelps’ 10 & under National Age Group Record. https://swimswam.com/foster-breaks-legendary-michael-phelps-nag-record/
Also, so what? If the swimmer enjoys their time in the sport and has a relatively successful career, who cares? They’ll always remember breaking a NAG no matter the age. Kids grow and change at all different speeds.
Tough crowd
Also Ethan Wang’s time is from 2025, lol
I’ve mentioned this in another Tan thread, but I looked into this pretty extensively. Before Tan there were ( I don’t have it in front of me but from memory) about 12 boys who had a 5 top 20 all-time swims in LCM. More than half of the ones who were old enough to qualify ended up making a senior intentional squad.
There are three ways to look at this: focus on the ones who didn’t make it, focus on the ones who did, or just be proud of what the 12 years olds did.
There’s a right answer. Try and find it.
Good job Ayden. I hope you become a doctor, lawyer, banker or Olympic swimmer. Whatever it… Read more »
Vinny Marciano sounds like a character Joe Pesci would play in a mafia movie
I had seen the name Vinny Marciano in a few swimswam articles (similar to this, all-time age group rankings) but didn’t recall seeing his name throughout what would be his college years. A quick google search turned up articles explaining his path which veered from swimming.
What happened to him?
Decided that the time/mental demands of swimming were too draining, and switched over to rock climbing. Can’t blame him.
May you have continued success, Ayden.
Great job Ayden! Setting the standard for future young swimmers!!
Tan family are age group all-stars!
Only took about 10 teams so far.
just Bay Area things
Hiss. Spit.
I get the joke but this gets mentioned every time there is an article on this family.
I’m seeing on swimcloud that this swimmer has been a part of DART, CROW (which disbanded), then SRVA.
So one club switch and one club disbanding. So is the club hopping a totally unfair joke placed on this swimmer or am I missing something?
Edit… looks like Phoenix swim team too. So 2 club changes?
Disregard the joke. It’s almost certainly Joe Natina posting from a burner account, full of regret for “expelling” the entire Tan family from PLS simply because they refused to accept his delusions.
I mean, unless we are using our actual names these are all burner accounts. Are you Mr. Tan?
What do you mean? IknowmorethanJoe Is my actual name.
Thank you Captain Obvious! You saved the day once again.
Well, it is not that easy to find a supportive, positive environment for high performing kids to train at nowadays. Too many miserable coaches and parents such as yourself bathing in toxicity and liking it…