17-Yr-Old Tatsuya Murasa Clocks 48.75 100 Free JPN High School Record

2025 JAPAN SWIM

• Thursday, March 20th – Sunday, March 23rd
• Tokyo Aquatics Centre
• LCM (50m)
• SwimSwam Preview #1
• SwimSwam Preview #2
• Meet Central
• Day 1 Recap/Day 2 Recap/Day 3 Recap
• Live Results

We saw day three of the 2025 Japan Swim unfold from Tokyo, with the competition representing the sole qualification opportunity for the nation’s swimmers to add their names to this year’s World Championshps roster.

Unfortunately for Japanese swimming fans, the men’s 100m freestyle final this evening was void of any qualifiers, as winner Katsuhiro Matsumoto‘s gold medal-winning performance of 48.36 fell just .02 shy of the World Aquatics ‘A’ standard of 48.34.

As a consolation however, runner-up status in the race went to 17-year-old Tatsuya Murasa who clinched a new Japanese National High School Record with his time of 48.75.

Opening in 23.21 and closing in 25.54, Murasa lowered his own previous personal best and HS record of 48.87. That previous benchmark was put on the books at the National Sports Festival last September. Splits in that earlier outing included 23.69/25.18.

Murasa now ties Olympic champion Kosuke Hagino as Japan’s 7th-swiftest 100m freestyle performer ever.

For additional perspective, Murasa would rank as the 5th-quickest U.S. 17-and-18-year-old boy in history, even ranking ahead of Olympic champion Caeleb Dressel who was 48.78 in that age group.

Murasa’s new PB is par for the course for this rising ace. Earlier in this competition he crushed a new Japanese National High School Record of 1:45.67 in the 200m free to claim the gold and add his name to the Singapore roster.