Mitsunori Seki is outside the current major-body rankings. His most recent ranking was May 1968 in the Featherweight division.
Summary from monthly sanctioning-body lists in our database (not a fight record).
| Division | First entered rankings | Most recently in rankings | Time ranked |
|---|---|---|---|
| Featherweight | September 1962 | May 1968 | 4 years 11 months |
| Bantamweight | June 1962 | June 1962 | 1 month |
| Flyweight | June 1960 | October 1961 | 1 year 5 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.