The World Boxing Organization (WBO) is an organization which sanctions professional boxing bouts. It is recognized by the International Boxing Hall of Fame (IBHOF) as one of the four major world championship groups, alongside the World Boxing Association (WBA), World Boxing Council (WBC), and International Boxing Federation (IBF). The WBO's headquarters are located in San Juan, Puerto Rico.
Heavyweight is a weight class in combat sports and professional wrestling.
In boxing, the undisputed champion of a weight class is the boxer who simultaneously holds world titles from all major organizations recognized by each other and the International Boxing Hall of Fame. There are currently four major sanctioning bodies: WBA, WBC, WBO, and IBF. There were many undisputed champions before the number of major sanctioning bodies recognizing each other increased to four in 2007, but there have been only 19 boxers to hold all four titles simultaneously.
Paul "Silky" Jones is a former World Boxing Champion, who is known as Silky for his quickness and defensive prowess. He has a combined professional record of 31-12-1 in the welterweight, light-middleweight, middleweight, and super middleweight divisions. He defeated rugged American Verno Phillips for the Light Middleweight World Championship on 22 November 1995. Phillips would go on to achieve World Championship status three more times.
Donnie Liboon Nietes is a Filipino professional boxer. He is a world champion in four weight-classes, having previously held the WBO mini-flyweight title from 2007 to 2011; the WBO and The Ring magazine junior-flyweight titles between 2011 and 2016; IBF flyweight title from 2017 to 2018; and the WBO junior-bantamweight title from 2018 to 2019. He is the longest-reigning Filipino boxing world champion, surpassing in 2014 the record set in 1967 by Boxing Hall of Fame inductee Gabriel "Flash" Elorde. He was one of the first three Asian fighters with world titles in at least four weight classes alongside fellow Filipinos Manny Pacquiao and Nonito Donaire.
Gilberto Ramírez Sánchez is a Mexican professional boxer who has held the World Boxing Association (WBA) (Super) cruiserweight title since March 2024. He previously held the WBO super middleweight title from 2016 to 2019, and is the first boxer from Mexico to win a major world title in those weight classes. As of April 2024, Ramírez is ranked as the world's best active cruiserweight by BoxRec, sixth by The Ring magazine, and seventh by the Transnational Boxing Rankings Board.
Dmitry Yurievich Pirog is a Russian politician and former professional boxer. In boxing he competed from 2005 to 2012, and held the World Boxing Organization (WBO) middleweight title from 2010 to 2012. Although his career was cut short due to a debilitating back injury, he is one of the few professional boxers to win a world championship and retire undefeated.
Kazuto Ioka is a Japanese professional boxer. Who held the unified WBA and WBC mini-flyweight titles between 2011 and 2012, the WBA (Regular) light-flyweight title from 2012 to 2014, the WBA flyweight title from 2016 to 2017, having previously held the WBA (Regular) flyweight title from 2015 to 2016, and the WBO super-flyweight title from 2019 to 2023, and the WBA super-flyweight title from 2023 to 2024.
Claressa Maria Shields is an American professional boxer and professional mixed martial artist. She has held multiple world championships in five weight classes, including the undisputed female light middleweight title since March 2021; the World Boxing Organization (WBO) female light heavyweight title and the World Boxing Council (WBC) and World Boxing Federation (WBF) female heavyweight titles since July 2024; WBC and IBF female super middleweight titles from 2017 to 2018. Shields currently holds the record for becoming a two and three division world champion in the fewest professional fights. As of October 2022, she is ranked the world's best active female middleweight by BoxRec, as well as the best active female boxer, pound for pound, by ESPN and The Ring.
Savannah Rose Marshall is a British professional boxer and professional mixed martial artist. She has held world championships in two weight classes: the undisputed and Ring magazine female super-middleweight title since 2023; and the World Boxing Organization (WBO) female middleweight title from 2020 to 2022. As an amateur, she became the first British female world champion after securing gold at the 2012 World Championships.
Janibek Alimkhanuly is a Kazakh professional boxer and unified middleweight champion who has held the WBO title since 2022, and the IBF title since October 2023. As an amateur, he won gold medals at the 2013 World Championships, 2013 Asian Championships and 2014 Asian Games. He also represented Kazakhstan at the 2016 Summer Olympics in the middleweight division, losing in the quarter-finals. He won the WBO Interim middleweight title on May 21, 2022, before being elevated to full champion on August 30, 2022, and he then won the IBF title on October 14, 2023.
John Ryder is a British former professional boxer who competed from 2010 to 2024. He held an interim super-middleweight world title twice, and challenged twice for full world titles in that weight class, including the undisputed championship. At regional level, he challenged twice for the British middleweight title and once for the British super-middleweight title.
Timofei Konstantinovich Tszyu is an Australian professional boxer who held the World Boxing Organization (WBO) junior-middleweight title from 2023 to 2024. He is the son of former light-welterweight world champion of boxing, Kostya Tszyu and older brother of Nikita Tszyu.
Jaime Aarón Munguía Escobedo is a Mexican professional boxer. He held the WBO junior middleweight title from 2018 to 2019.
Mohammed Hamzah Sheeraz is a British professional boxer. He has held the Commonwealth middleweight title since 2022.
Junto Nakatani is a Japanese professional boxer. He has held world championships in three weight classes, including the World Boxing Organization (WBO) flyweight title from 2020 to 2022, the World Boxing Organization (WBO) junior-bantamweight title in 2023, and the World Boxing Council (WBC) bantamweight title since February 2024.
Dennis Hogan is an Irish professional boxer who is a former IBO super-welterweight World champion.
Sebastian Alexander Fundora is an American professional boxer and unified light middleweight champion who has held the World Boxing Council (WBC) and World Boxing Organization (WBO) titles since March 2024. As of July 2024, he is ranked as the best active light middleweight by The Ring magazine.
Andrei Mikhailovich Driessen is a Russian born, New Zealand raised professional boxer. He has won multiple New Zealand national championships in two weight classes from light middleweight to middleweight. At regional level, Mikhailovich has also won the IBF Pan-Pacific and WBO Global middleweight belts.
Osleys Iglesias Estrada is the current IBO Super middleweight champion and he is currently ranked No. 7 in the super middleweight rankings by BoxRec and No. 8 by The Ring.
MGM Grand, Grand Garden Arena, Las Vegas, Nevada U.S.
