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

2025 JPN JUNIOR LONG COURSE CHAMPIONSHIPS

• 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

1. Kosuke Hagino – 4:06.05, 2016
2. Daiya Seto – 4:06.09, 2020
3. Tomoyuki Matsushita – 4:08.61, 2025
4. Asaki Nishikawa – 4:09.63, 2025
5. Kosuke Makino – 4:09.79, 2025
6. Tomoru Honda – 4:09.98, 2023
7. Yuya Horihata – 4:10.52, 2012
8. Takeharu Fujimori – 4:10.90, 2017
9. Kaito Tabuchi – 4:11.15, 2024
10. Yuki Ikari – 4:11.88 – 2021
11. Riku Yamaguchi – 4:12.06, 2024
12. 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.