Osamu Sato is outside the current major-body rankings. His most recent ranking was December 2004 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 | February 2004 | December 2004 | 11 months |
| Super Bantamweight | January 2000 | May 2004 | 4 years 3 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.