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 two months ago 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.
Meanwhile, Saul 'Canelo' Alvarez (middleweight), Julian Williams (light middleweight), Vasily Lomachenko (lightweight) and Daniel Roman (super-bantamweight) currently hold two of those four titles at their respective weights.
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 | Anthony Dirrell |
| WBA (Super) | Callum Smith |
| IBF | Caleb Plant |
| WBO | Billy Joe Saunders |
Middleweight
| WBC | Jermall Charlo |
| WBA (Super) | Saul 'Canelo' Alvarez |
| IBF | Vacant |
| WBO | Demetrius Andrade |
Super welterweight
| WBC | Tony Harrison |
| WBA | Julian Williams |
| IBF | Julian Williams |
| WBO | Jaime Munguia |
Welterweight
| WBC | Shawn Porter |
| 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 | Vacant |
| WBA | Vasyl Lomachenko |
| IBF | Richard Commey |
| WBO | Vasyl Lomachenko |
Super featherweight
| WBC | Miguel Berchelt |
| WBA (Super) | Gervonta Davis |
| IBF | Tevin Farmer |
| WBO | Jamel Herring |
Featherweight
| WBC | Gary Russell Jr |
| WBA (Super) | Leo Santa Cruz |
| IBF | Josh Warrington |
| WBO | Oscar Valdez |
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 | Moruti Mthalane |
| WBO | Kazuto Ioka |
Flyweight
| WBC | Charlie Edwards |
| WBA | Artem Dalakian |
| IBF | Felix Alvarado |
| WBO | Elwin Soto |
