With 17 weight classes in boxing and four major sanctioning bodies that bestow world titles, keeping track of who holds each of the belts can be difficult -- especially when there are sometimes multiple titlists in each organization because of interim and secondary belts.
To make it easier for boxing fans, below is a quick reference chart of who holds each of the titles in the four organizations
To check the top 10 fighters in each division, visit ESPN's divisional rankings.
For a list of the best fighters regardless of weight class, check ESPN's pound-for-pound rankings.
Heavyweight (Unlimited)
WBO: Oleksandr Usyk*
IBF: Daniel Dubois
WBA: Oleksandr Usyk**
WBC: Oleksandr Usyk
*Joseph Parker is the WBO interim heavyweight champion
**Kubrat Pulev is the WBA "regular" heavyweight champion
Cruiserweight (200 lbs.)
WBO: Gilberto Ramirez
IBF: Jai Opetaia
WBA: Gilberto Ramirez
WBC: Norair Mikaeljan
Light heavyweight (175 lbs.)
WBO: Artur Beterbiev
IBF: Artur Beterbiev
WBA: Artur Beterbiev
WBC: Artur Beterbiev*
*David Benavidez is the WBC interim light heavyweight champion
Super middleweight (168 lbs.)
WBO: Canelo Alvarez
IBF: William Scull
WBA: Canelo Alvarez
WBC: Canelo Alvarez*
*David Benavidez is the WBC interim super middleweight champion
Middleweight (160 lbs.)
WBO: Janibek Alimkhanuly
IBF: Janibek Alimkhanuly
WBA: Erislandy Lara
WBC: Carlos Adames
Junior middleweight (154 lbs.)
WBO: Sebastian Fundora*
IBF: Bakhram Murtazaliev
WBA: Terence Crawford**
WBC: Sebastian Fundora***
*Terence Crawford is the WBO interim junior middleweight champion
**Jermell Charlo is the WBA junior middleweight champion in recess
***Vergil Ortiz Jr. is the WBC interim junior middleweight champion
Welterweight (147 lbs.)
WBO: Brian Norman Jr.
IBF: Jaron Ennis
WBA: Eimantas Stanionis
WBC: Mario Barrios
*Terence Crawford is the WBC welterweight champion in recess.
Junior welterweight (140 lbs.)
WBO: Teofimo Lopez Jr.
IBF: Richardson Hitchins
WBA: Jose Valenzuela
WBC: Alberto Puello*
*Devin Haney is the WBC junior welterweight champion in recess
Lightweight (135 lbs.)
WBO: Denys Berinchyk
IBF: Vasiliy Lomachenko
WBA: Gervonta Davis
WBC: Shakur Stevenson*
*William Zepeda is the WBC interim junior welterweight champion
Junior lightweight (130 lbs.)
WBO: Emanuel Navarrete
IBF: Anthony Cacace
WBA: Lamont Roach*
WBC: O'Shaquie Foster
*Albert Batyrgaziev is the WBA interim junior lightweight champion
Featherweight (126 lbs.)
WBO: Rafael Espinoza
IBF: Angelo Leo
WBA: Nick Ball
WBC: Brandon Figueroa*
*Rey Vargas is the WBC featherweight champion in recess
Junior featherweight (122 lbs.)
WBO: Naoya Inoue
IBF: Naoya Inoue
WBA: Naoya Inoue
WBC: Naoya Inoue
Bantamweight (118 lbs.)
WBO: Yoshiki Takei
IBF: Ryosuke Nishida
WBA: Seiya Tsutsumi
WBC: Junto Nakatani
Junior bantamweight (115 lbs.)
WBO: Phumelele Cafu
IBF: Vacant
WBA: Fernando Martinez*
WBC: Jesse Rodriguez*
*David Jimenez is the WBA interim junior bantamweight champion
**Pedro Guevara is the WBC interim junior bantamweight champion
Flyweight (112 lbs.)
WBO: Anthony Olascuaga
IBF: Angel Ayala
WBA: Seigo Yuri Akui
WBC: Kenshiro Teraji*
*Galal Yafai is the WBC interim flyweight champion
Junior flyweight (108 lbs.)
WBO: Shokichi Iwata
IBF: Masamichi Yabuki
WBA: Vacant
WBC: Vacant
Strawweight (105 lbs.)
WBO: Oscar Collazo
IBF: Pedro Taduran
WBA: Oscar Collazo
WBC: Melvin Jerusalem