Oleksandr Usyk is currently the RING Heavyweight Champion after moving up from Cruiserweight.
Summary from monthly sanctioning-body lists in our database (not a fight record).
| Division | First entered rankings | Most recently in rankings | Time ranked |
|---|---|---|---|
| Heavyweight | April 2019 | July 2026 | 7 years 4 months |
| Cruiserweight | October 2014 | September 2019 | 5 years |
| Light Heavyweight | August 2017 | August 2017 | 1 month |
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.