Japan’s 16-Yr-Old Raito Numata Blasts 4:12.10 400 IM

Saturday, May 11th & Sunday, May 12th
Tokyo, Japan
LCM (50m)
Results

The 2025 Japanese Junior Long Course Championships took place this weekend with a big-time swim occurring in the boys’ 400m IM final.

16-year-old Raito Numata fired off a winning result of 4:12.10 to get to the wall over 7 seconds ahead of the competition.

The outing represented a huge personal best, overwriting his previous career-quickest time of 4:15.90 clocked at this year’s Japan Swim.

Below are the splits for the teen who just became Japan’s 12th-swiftest performer of all time in the 400m IM.

Top 10 Japanese Men’s LCM 400 IM Performers All-Time

Kosuke Hagino – 4:06.05, 2016
Daiya Seto – 4:06.09, 2020
Tomoyuki Matsushita – 4:08.61, 2025
Asaki Nishikawa – 4:09.63, 2025
Kosuke Makino – 4:09.79, 2025
Tomoru Honda – 4:09.98, 2023
Yuya Horihata – 4:10.52, 2012
Takeharu Fujimori – 4:10.90, 2017
Kaito Tabuchi – 4:11.15, 2024
Yuki Ikari – 4:11.88 – 2021
Riku Yamaguchi – 4:12.06, 2024
Raito Numata – 4:12.10, 2025

Numata’s time easily cleared the World Aquatics ‘A’ standard 4:17.48 for the World Championships; however, the Japan Swim marked the sole qualification competition for Japanese swimmers. He ultimately placed 7th there in Tokyo.

He ranks 6th in the world on the season.

For additional perspective, Numata’s performance beats the reigning U.S. National Age Group Record for 15-16-year-old boys by over 2 seconds. That benchmark is represented by the 4:14.73 Olympian Carson Foster established nearly 7 years ago.