Kosei Tanaka is outside the current major-body rankings. His most recent ranking was May 2025 in the Super Flyweight division.
Summary from monthly sanctioning-body lists in our database (not a fight record).
| Division | First entered rankings | Most recently in rankings | Time ranked |
|---|---|---|---|
| Super Flyweight | February 2020 | May 2025 | 5 years 1 month |
| Flyweight | December 2017 | February 2021 | 3 years 2 months |
| Light Flyweight | April 2016 | November 2017 | 1 year 8 months |
| Minimumweight | March 2014 | April 2016 | 2 years 2 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.