Andy Ruiz Jr holds three of boxing's four major heavyweight world titles following his stunning upset victory over Anthony Joshua in June.
The man few casual boxing fans will have even heard of earlier this year is currently the closest we have to a unified world champion across 17 weights in the sport.
Oleksandr Usyk held that distinction before his decision to vacate the cruiserweight belts and move up to the heavyweight ranks earlier this year.
While there is a host of 'regular', interim and diamond title belts regularly confusing matters, the WBC, WBA, IBF and WBO each have their own definitive world champion.
Standard Sport lists the current belt holders below.
Heavyweight
| WBC | Deontay Wilder |
| WBA (Super) | Andy Ruiz Jr |
| IBF | Andy Ruiz Jr |
| WBO | Andy Ruiz Jr |
Cruiserweight
| WBC | Vacant |
| WBA (Super) | Arsen Goulamirian |
| IBF | Yuniel Dorticos |
| WBO | Mairis Briedis |
Light heavyweight
| WBC | Oleksandr Gvozdyk |
| WBA | Dmitry Bivol |
| IBF | Artur Beterbiev |
| WBO | Sergey Kovalev |
Super middleweight
| WBC | David Benavidez |
| WBA (Super) | Callum Smith |
| IBF | Caleb Plant |
| WBO | Billy Joe Saunders |
Middleweight
| WBC | Jermall Charlo |
| WBA (Super) | Saul 'Canelo' Alvarez |
| IBF | Gennady Golovkin |
| WBO | Demetrius Andrade |
Super welterweight
| WBC | Tony Harrison |
| WBA | Julian Williams |
| IBF | Julian Williams |
| WBO | Jaime Munguia |
Welterweight
| WBC | Errol Spence Jr |
| WBA (Super) | Manny Pacquiao |
| IBF | Errol Spence Jr |
| WBO | Terence Crawford |
Super Lightweight
| WBC | Jose Ramirez |
| WBA | Regis Prograis |
| IBF | Josh Taylor |
| WBO | Jose Ramirez |
Lightweight
| WBC | Vasyl Lomachenko |
| WBA | Vasyl Lomachenko |
| IBF | Richard Commey |
| WBO | Vasyl Lomachenko |
Super featherweight
| WBC | Miguel Berchelt |
| WBA (Super) | Andrew Cancio |
| IBF | Tevin Farmer |
| WBO | Jamel Herring |
Featherweight
| WBC | Gary Russell Jr |
| WBA (Super) | Leo Santa Cruz |
| IBF | Josh Warrington |
| WBO | Vacant |
Super bantamweight
| WBC | Rey Vargas |
| WBA (Super) | Daniel Roman |
| IBF | Daniel Roman |
| WBO | Emanuel Navarrete |
Bantamweight
| WBC | Nordine Oubaali |
| WBA (Super) | Nonito Donaire |
| IBF | Naoya Inoue |
| WBO | Zolani Tete |
Super flyweight
| WBC | Juan Francisco Estrada |
| WBA | Kal Yafai |
| IBF | Jerwin Ancajas |
| WBO | Kazuto Ioka |
Flyweight
| WBC | Vacant |
| WBA | Artem Dalakian |
| IBF | Felix Alvarado |
| WBO | Elwin Soto |
