Kỷ lục thế giới trẻ 56.35 của Imaizumi: Tín hiệu thật hay chỉ là 'cú nổ' ở giải cấp tỉnh?

**Core answer:** Yusei Imaizumi, 17, set a World Junior Record of 56.35 in the SCM 100m breaststroke at the Niigata Prefectural High School Autumn Tournament on September 4, 2026, breaking Shin Ohashi's previous mark of 56.65. **Key facts:** - Imaizumi improved his personal best by 0.83 seconds from 57.18 in March 2026. - He won two golds at the Junior Pan Pacific Championships this summer (100m breast 59.98, 50m breast 27.55). - The margin over the next competitor was approximately 7 seconds. **Source attribution:** Stage-2 analysis based on original event report, September 2026 | Cross-checked: VuaBong.vn **Related Q&A:** Q: Is this a senior-level time? A: It is comparable to senior LCM swims at the Japanese Intercollegiate Championships, but SCM-to-LCM transfer is unproven. Q: Who holds the senior World Record? A: Ilya Shymanovich holds the SCM WR at 55.28 (2021).