Boxing is a complicated and convoluted sport with several world champions in each division.
Most observers recognise that we are now in a four-belt era, with the WBA, WBC, IBF and WBO all given credibility as legitimate world titles.
See the full list of the current men's boxing world champions below...
Heavyweight (200lbs+)
WBA - Oleksandr Usyk
WBC - Tyson Fury
IBF - Oleksandr Usyk
WBO - Oleksandr Usyk
*Mahmoud Charr has the lesser WBA 'regular' belt
*Zhilei Zhang has the lesser WBO 'interim' belt
Bridgerweight (224lbs)
WBC - Lukasz Rozanski
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Cruiserweight (200lbs)
WBA - Arsen Goulamirian
WBC - Noel Mikaelian
IBF - Jai Opetaia
WBO - Chris Billam-Smith
Light-Heavyweight (175lbs)
WBA - Dmitry Bivol
WBC - Artur Beterbiev
IBF - Artur Beterbiev
WBO - Artur Beterbiev
Super-Middleweight (168lbs)
WBA - Canelo Alvarez
WBC - Canelo Alvarez
IBF - Canelo Alvarez
WBO - Canelo Alvarez
*David Morrell has the lesser WBA 'regular' belt
*David Benavidez has the lesser WBC 'interim' belt
Middleweight (160lbs)
WBA - Erislandy Lara
WBC - Jermall Charlo
IBF - Janibek Alimkhanuly
WBO - Janibek Alimkhanuly
*Carlos Adames has the lesser WBC 'interim' belt
Super-Welterweight (154lbs)
WBA - Jermell Charlo
WBC - Jermell Charlo
IBF - Jermell Charlo
WBO - Tim Tszyu
Welterweight (147lbs)
WBA - Terence Crawford
WBC - Terence Crawford
IBF - Jaron Ennis
WBO - Terence Crawford
*Eimantas Stanionis has the lesser WBA 'regular' belt
*Mario Barrios has the lesser WBC 'interim' belt
Super-Lightweight (140lbs)
WBA - Rolly Romero
WBC - Regis Prograis
IBF - Subriel Matias
WBO - Teofimo Lopez
Lightweight (135lbs)
WBA - Devin Haney
WBC - Vacant
IBF - Devin Haney
WBO - Devin Haney
*Gervonta Davis has the lesser WBA 'regular' belt
Super-Featherweight (130lbs)
WBA - Hector Garcia
WBC - O'Shaquie Foster
IBF - Joe Cordina
WBO - Emanuel Navarrete
Featherweight (126lbs)
WBA - Leigh Wood
WBC - Rey Vargas
IBF - Luis Alberto Lopez
WBO - Robeisy Ramirez
*Brandon Figueroa has the lesser WBC 'interim' belt
Super-Bantamweight (122lbs)
WBA - Marlon Tapales
WBC - Naoya Inoue
IBF - Marlon Tapales
WBO - Naoya Inoue
Bantamweight (118lbs)
WBA - Takuma Inoue
WBC - Alexandro Santiago
IBF - Emmanuel Rodriguez
WBO - Jason Moloney
Super-Flyweight (115lbs)
WBA - Kazuto Ioka
WBC - Juan Estrada
IBF - Fernando Martinez
WBO - Junto Nakatani
*Carlos Cuadras has the lesser WBC 'interim' belt
Flyweight (112lbs)
WBA - Artem Dalakian
WBC - Julio Cesar Martinez
IBF - Sunny Edwards
WBO - Jesse Rodriguez
Light-Flyweight (108lbs)
WBA - Kenshiro Teraji
WBC - Kenshiro Teraji
IBF - Adrian Curiel
WBO - Jonathan Gonzalez
Minimumweight (105lbs)
WBA - Knockout CP Freshmart (Thammanoon Niyomtrong)
WBC - Yudai Shigeoka
IBF - Ginjiro Shigeoka
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WBO - Oscar Collazo
*Erick Rosa has the lesser WBA 'regular' belt