15-Yr-Old Mio Narita Of Japan Rips 4:36.71 400 IM WJR*


  • Wednesday, March 2nd – Saturday, March 5th
  • Tatsumi International Swimming Centre, Tokyo, Japan
  • LCM (50m)
  • Selection Meet for 2022 Budapest World Championships, 2022 Asian Games, World University Games
  • Results

Full Day 2 Recap to follow.

In addition to the eye-catching swims produced by 27-year-old Reona Aoi here at these Japanese Trials, another swimmer on the women’s side is doing major damage.

While competing on day 2 of the Selection Meet in Tokyo, 15-year-old Mio Narita busted out the swim of her life in the 400m IM, stopping the clock in a big-time result of 4:36.71.

The first time she’s ever been under 4:40 in the event, Narita’s 4:36.71 outing here not only establishes a huge personal best for the teen but it also nearly knocked off the World Junior Record in the event.

The unofficial WJR* stands at the 4:35.94 Yu Yiting produced in January of last year in her native China. That record is still awaiting FINA ratification. The official record according to FINA still is represented by the 4:38.53 Alba Vazquez put up in 2019.

Below are the splits for the race, with teen Narita snagging the silver in her 4:36.71, while Ageha Tanigawa established a new Japanese High School National Record with her impressive 4:36.45 as the winner.

Tanigawa’s previous PB was marked by the 4:37.90 she hit at least year’s Trials. Here, reigning Olympic champion Yui Ohashi settled for bronze in 4:41.96, but already qualified to race this event in Budapest by way of her Olympic gold.


But, as we’ve reported, Narita has already been wreaking havoc in the women’s 400m IM. Just last month Narita logged a mark of 4:40.86 to establish a new National Junior High School Record. That sliced .02 off of the 4:40.88 Narita put up at the 2021 Japan Open last June.

As such, within a span of one year, Narita has figured out a way to drop over 4 seconds from her prime event.

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Replace FINA
10 months ago

At 15 that’s eye popping.

Standard rant about WJR blah blah blah you get it at this point we deserve better than FINA next

Lil Swimmy
10 months ago


10 months ago

According to all the Japanese coverage I’ve seen, Ohashi did qualify and will be going instead of Narita. As the gold medalist at the Olympics, Ohashi automatically qualified to represent Japan at Worlds. She swam pretty slow and apparently cried after.


10 months ago

Wait ohashi didn’t qualify 🥲

Reply to  Virtus
10 months ago

Nope she did, as the winner of the olympics, she automatically qualifies

10 months ago

The Japs know how to swim a good IM

Reply to  SigmaAlphaBetaMale
10 months ago

Did you have to word it that way

Reply to  Landen
10 months ago


Reply to  SigmaAlphaBetaMale
10 months ago

What a very ignorant and concerning choice of words

Reply to  Swimmerfromjapananduk
10 months ago

Would you mind explaining why it’s inappropriate…only if this forum is suitable for such explanation

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