Andy Ruiz Jr. – Joseph Parker – World Boxing Organization – Heavyweight – Anthony Joshua – Dillian Whyte – Oleksandr Usyk – Derek Chisora – Deontay Wilder

Anthony Joshua will defend his WBA (super), IBF, WBO and IBO heavyweight titles on Saturday against Oleksandr Usyk at the Tottenham Hotspur Stadium in London, England.

Joshua, who won 3 of his iv belts against Wladimir Klitschko in April of 2017, will be making his tertiary consecutive title defense force after he momentarily lost his belts to Andy Ruiz Jr. in December of 2019. He defeated Ruiz in a rematch and and then knocked out Kubrat Pulev in December of 2020.

MORE: Betting preview for Joshua-Usyk

Usyk, who was formerly the undisputed champion at cruiserweight, will be making his third advent at heavyweight, in which he is ranked as the No. 4 fighter backside Tyson Fury, Joshua and Deontay Wilder on ESPN. He defeated Chazz Witherspoon by referee technical decision in October of 2019 and then Derek Chisora by unanimous decision in October of 2020.

The winner of Sabbatum’southward bout will likely promote himself to face the winner of Fury and Wilder on October. 9. Joshua and Fury signed a two-fight bargain to unify their heavyweight titles — Fury is the WBC and The Ring mag — though things could change depending on results of their respective next bout.

The heavyweight division has not had an undisputed champion since Lennox Lewis in 2000, so Joshua and Fury’s results will take big implications for the sport’s history. Here’due south a expect at each title Fury and Joshua concord by each governing trunk.

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World Battle Association — Anthony Joshua

Joshua won the World Battle Clan (super) title on Apr 29, 2017, after defeating Klitschko by an 11th-circular knockout and regained the belt after beating Ruiz in a rematch.

The WBA has been around since 1921 and was referred to as the National Boxing Association until Aug. 23, 1962. The WBA tin accept up to four world champions in any given weight sectionalization, though Joshua holds the most important distinction with the super championship.

More than: How to watch Joshua-Usyk

American boxer Trevor Bryan is currently recognized as the world champion of the division, while Syrian Mahmoud Charr is the champion in recess.

Earth Boxing Quango — Tyson Fury

Fury became the WBC champion on Feb. 22, 2020 by defeating Wilder, who previously held the belt since January of 2015.

Fury is even so to defend his championship, equally his third fight with Wilder in July was postponed subsequently his military camp suffered a COVID-19 outbreak. Fury became the 3rd heavyweight to win the championship in the past seven years, as Bermane Stiverne was recognized equally the divisional champion from 2014 to 2015.

The WBC was formed in 1963, and its dark-green belt portrays the 161 flags of the countries that correspond the sanctioning body. Britain’due south Dillian Whyte is recognized equally the interim champion at heavyweight and is the immediate challenger for the winner of Fury and Wilder.

Fury previously said if he defeats Wilder, he would like to fight Whyte in Dec.

MORE: Fury plans out his adjacent five fights

World Boxing Arrangement — Anthony Joshua

Joshua won the Earth Boxing Organization title in March of 2018 over Joseph Parker and got information technology back after his rematch with Ruiz.

The WBO, which was formed in 1988, was recognized as i of the four major world title groups past the International Battle Hall of Fame forth with the WBA, WBC and IBF in 2004.

The WBO recognizes “super” champions, in which a boxer has held a multiple-fight contract with a major television network for multiple years and dedicated his title cumulatively for ten bounds or against opponents of high recognition, among other criteria. Joshua has been labeled as a super champion along with Klitschko, while Usyk earned the recognition at cruiserweight.

International Boxing Federation — Anthony Joshua

Joshua first won the International Boxing Federation title in April of 2016 confronting Charles Martin and has held the chugalug the longest out of his electric current championships.

The IBF, which was preceded by the United States Boxing Association, has had seven champions since 2002: Lennox Lewis; Chris Byrd; Klitschko; Fury; Charles Martin; Ruiz; and Joshua.

The Band Magazine — Tyson Fury

The Ring is a premiere battle mag that began publication in 1922, which is also when it began awarding a linear title to each division.

Fury won The Ring’s vacant title in his 2nd fight against Wilder. He previously earned it with his unanimous decision victory over Klitschko in November of 2015 but was stripped in Jan of 2018 due to inactivity.

The Band’s initial policy was to honor a title based on a linear reign, or “the man who beat the man.” Now, the vacancy tin be filled if the No. one and No. 2 contenders fight one another, or a champion could lose his belt from one of the following 7 conditions:

• The champion loses a fight in the weight class in which he is champion.
• The champion moves to another weight class.
• The champion does non schedule a fight in any weight class for 18 months.
• The champion does non schedule a fight at his championship weight for xviii months (fifty-fifty if he fights at another weight).
• The champion does not schedule a fight with a top-v contender from any weight class for two years.
• The champion retires.
• The champion tests positive for a performance-enhancing substance and is fined, suspended or otherwise penalized by the proper authority (athletic committee or sanctioning body).

Other belts and sometime undisputed champions

Joshua’s International Battle Organization belt will also exist at stake, though information technology is considered a “minor” title as it is non recognized as 1 of the “big four” governing bodies.

If Joshua, Wilder, Fury or Usyk meet to unify globe titles from all of the major sanctioning organizations, the heavyweight division will have its first undisputed champion since Lennox Lewis in 2000. The partition has not yet had an undisputed titleholder in the iv-belt era.

Here are a list of undisputed heavyweight champions in boxing’south history, from the New York State Athletic Committee and National Boxing Clan years to the current era.