Guillermo Jones has ranking history, with the latest entry from December 2018 in the Heavyweight division.
Summary from monthly sanctioning-body lists in our database (not a fight record).
| Division | First entered rankings | Most recently in rankings | Time ranked |
|---|---|---|---|
| Heavyweight | May 2016 | December 2018 | 2 years 8 months |
| Cruiserweight | November 2002 | November 2013 | 10 years 6 months |
| Light Heavyweight | January 2000 | January 2000 | 1 month |
| Super Middleweight | July 2000 | August 2001 | 11 months |
| Middleweight | January 2000 | November 2000 | 11 months |
| Super Welterweight | April 1997 | July 1997 | 4 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.