Masamichi Yabuki is Champion with the IBF at Flyweight after moving up from Light Flyweight.
Summary from monthly sanctioning-body lists in our database (not a fight record).
| Division | First entered rankings | Most recently in rankings | Time ranked |
|---|---|---|---|
| Flyweight | March 2025 | July 2026 | 1 year 5 months |
| Light Flyweight | October 2020 | March 2025 | 4 years 6 months |
Time ranked counts distinct months this fighter appears on a rankings list for that division. If they drop out and return later, months off the ranking lists are not included.