Undisputed championship (boxing)

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 24 boxers (11 male and 13 female) to hold all four titles simultaneously.

Prior to the 1960s, most champions were "undisputed", although the term was rarely used (it does not appear in one 1970 Boxing Dictionary). Early boxing champions at various weight divisions were established by acclamation between 1880 and 1920. Once a consensus champion had been awarded the title, the championship could usually be taken only by beating the reigning holder, establishing a lineal championship.

The New York State Athletic Commission (NYSAC) recognized champions from its foundation in 1920. The National Boxing Association (NBA) was founded by other U.S. state bodies in 1921, and began recognising champions in 1927. Until the 1960s, both usually recognised the same lineal champion. However, disputes could arise if the champion retired or moved to a different weight class. Occasionally, the International Boxing Union (renamed the European Boxing Union in 1946) recognised a different champion. The disputes were usually short-lived as a lucrative fight would be organised between the rival champions. The longest split was ten years, of the middleweight title, between Mickey Walker's move up to heavyweight in 1931 and NBA champion Tony Zale's defeat of NYSAC contender Georgie Abrams in 1941. An early use of "undisputed" appears in a New York Times preview of the 1941 fight.

The growing popularity of boxing outside of the U.S. led to creation of various boxing organizations, each strengthening their influence – most notably the British Boxing Board of Control (BBBofC) – and having their own champion. This resulted in a growing number of boxers claiming to be legitimate champions. The disruption in boxing was solved after World War II when the World Championship Committee (WCC) was created with NBA as its unanimous authority. The committee, however, was disbanded in 1955 when NBA, along with its new members (which included the Orient, Mexican and South American federations and boxing commissions of the Philippines and Thailand) left WCC citing lack of control over the organisation. The NBA's voting scheme guaranteed one vote for each state commission as well as one vote for each foreign country. On August 23, 1962, the NBA officially became the World Boxing Association and moved their headquarters to Panama City, Panama.

A year later NYSAC along with European Boxing Union and BBBofC supported creation of the World Boxing Council. WBC was officially established on February 14, 1963, in Mexico City, Mexico by 11 countries (the U.S., Argentina, U.K., France, Mexico, Philippines, Panama, Chile, Peru, Venezuela and Brazil) that were invited by the President of Mexico Adolfo López Mateos to form an international organization to unify all commissions of the world to control the expansion of boxing. The reason for the move were concerns about WBA's alleged lack of desire to support professional boxing outside of the U.S..

In April 1983, members of United States Boxing Association along with Robert W. Lee (a former WBA vice-president) voted to expand the organisation and form the USBA-International. The organization later changed the name to International Boxing Federation. The inaugural IBF heavyweight champion was Larry Holmes, who relinquished the WBC title to accept IBF's recognition, thus helping the newly formed organization to establish its legitimacy. The fragmentation of titles was thus increased. After some negotiations, the heavyweight title was unified in the heavyweight unification series, a series of coordinated bouts in 1986 and 1987, with Mike Tyson emerging as the first undisputed champion (WBA, WBC, and IBF) since Leon Spinks in 1978. The title was split again in 1992 when Riddick Bowe forfeited the WBC title.

Another major sanctioning body, the World Boxing Organization, was established in 1988 in San Juan, Puerto Rico by a group of local businessmen. At the beginnings, when most of the challengers for WBA, WBC, and IBF titles were Americans, WBO had a wider variety of countries, mainly European, represented in title bouts. Before the Klitschko Era, the United Kingdom tied the United States for most wins in WBO heavyweight title fights with eight. In 1997, WBO titlist Naseem Hamed was allowed to unify titles for the first time in WBO history; on February 8, he defeated Tom Johnson to become unified WBO and IBF featherweight champion. By 2001, the WBA was giving the same recognition to WBO champions as to WBA, WBC, and IBF champions. In 2004, the WBC began naming WBO champions on its ranking listings. The IBF did not recognise the WBO in May 2006, but was doing so by February 2007. Conversely, the WBO has been explicitly recognizing the other three sanctioning bodies since at least October 1, 2008.

Until at least 2008, many considered it sufficient to hold the WBA, WBC, and IBF titles. Other bodies such as the IBO, IBU, and World Boxing Foundation are disregarded.