Lennox Claudius Lewis is a boxing commentator and former professional boxer who competed from 1989 to 2003. He is a three-time world heavyweight champion, a two-time lineal champion, and the last heavyweight to hold the undisputed championship. Holding dual British and Canadian citizenship, Lewis represented Canada as an amateur at the 1984 and 1988 Olympics; in the latter, he won a gold medal in the super-heavyweight division after defeating Riddick Bowe in the final.
The World Boxing Council (WBC) is an international professional boxing organization. It is among the four major organizations which sanction professional boxing bouts, alongside the World Boxing Association (WBA), International Boxing Federation (IBF) and World Boxing Organization (WBO).
Carlos De León, also known as "Sugar" De Leon, was a Puerto Rican boxer who made history by becoming the first cruiserweight to win the world title twice. Subsequently, he kept breaking his own record for the most times as cruiserweight champion by regaining the title on two further occasions.
Michael Spinks is an American former professional boxer who competed from 1977 to 1988. He held world championships in two weight classes, including the undisputed light heavyweight title from 1983 to 1985, and the lineal heavyweight title from 1985 to 1988. As an amateur he won a gold medal in the middleweight division at the 1976 Summer Olympics.
Evander Holyfield is an American former professional boxer who competed between 1984 and 2011. He reigned as the undisputed champion at cruiserweight in the late 1980s and at heavyweight in the early 1990s, and is the only boxer in history to win the undisputed championship in two weight classes in the three belt era. Nicknamed "the Real Deal", Holyfield is the only four-time world heavyweight champion, having held the unified WBA, WBC, and IBF titles from 1990 to 1992, the WBA and IBF titles again from 1993 to 1994, the WBA title a third time from 1996 to 1999; the IBF title a third time from 1997 to 1999 and the WBA title for a fourth time from 2000 to 2001.
Leon Spinks was an American professional boxer who competed from 1977 to 1995. In only his eighth professional fight, he won the undisputed heavyweight championship in 1978 after defeating Muhammad Ali in a split decision, in what is considered one of the biggest upsets in boxing history. Spinks was later stripped of the WBC title for facing Ali in an unapproved rematch seven months later, which he lost by a unanimous decision.
Dwight Muhammad Qawi is an American former professional boxer who competed from 1978 to 1998. He was a world champion in two weight classes, having held the WBC and Ring magazine light heavyweight titles from 1981 to 1983, and the WBA cruiserweight title from 1985 to 1986. Qawi was inducted into the International Boxing Hall of Fame in 2004.
Tim Witherspoon is an American former professional boxer who competed from 1979 to 2003. He was a two-time world heavyweight champion, having held the WBC title in 1984, and the WBA title in 1986. Witherspoon also worked as a regular sparring partner for Muhammad Ali.
Jean-Marc Gilbert Mormeck is a French former professional boxer who competed from 1995 to 2014. He is a two-time unified world cruiserweight champion, having held the WBA, WBC and The Ring world titles twice between 2005 and 2007. He was the first boxer to hold unified cruiserweight title since Evander Holyfield in 1988, and the first fighter to hold The Ring cruiserweight title since Carlos De León in 1987. He was ranked by BoxRec as the world's top 10 cruiserweight from 2001 to 2005 and in 2007, and was ranked No.1 in 2003 and 2004. Mormeck also challenged for the unified world heavyweight title in 2012.
O'Neil Bell was a Jamaican professional boxer who competed from 1998 to 2011. He held the undisputed cruiserweight title in 2006 and the lineal cruiserweight title from 2006 to 2007.
Bruce Samuel Seldon is an American former professional boxer who competed from 1988 to 1996, and 2004 to 2009. He held the WBA heavyweight title from 1995 to 1996, most notably losing to Mike Tyson via knockout in his second defense.
In professional boxing, the undisputed champion of a weight class is the boxer who holds world titles from all of the major sanctioning organisations simultaneously. There are currently four major sanctioning bodies: WBA, WBC, IBF and WBO. There were many undisputed champions before the number of major sanctioning bodies increased to four in 2007, but there have only been 13 boxers to hold all four titles simultaneously. As of January 2023, Canelo Álvarez, Jermell Charlo and Devin Haney are undisputed champions in the super middleweight, light middleweight and lightweight divisions respectively.
Jesse Burnett is an American former professional boxer. His professional record was 23-18-2 with 11 knockouts. He is best remembered as the spoiler who won a twelve round decision in a WBC cruiserweight elimination bout over former world light-heavyweight champion Victor Galindez of Argentina in 1980, sending Galindez into retirement. In Burnett's two tries at a world title, he was stopped in the ninth round of a 1977 vacant WBC light-heavyweight title bout by Miguel Angel Cuello, and stopped in the eighth round of a 1983 WBC cruiserweight title bout against S.T. Gordon. Burnett also fought such other fighters as former heavyweight champion Leon Spinks, former light-heavyweight champion John Conteh, former light-heavyweight champion Eddie Mustafa Muhammad, and other contenders such as Yaqui Lopez, James Scott, Jerry Martin, Tony Mundine, Bash Ali, Willie Edwards, Mustafa Wassaja, Willie Edwards, Lotte Mwale, and many others.
Chad Dawson is an American former professional boxer who competed from 2001 to 2019. He has held multiple light heavyweight world championships, and was one of the most highly regarded boxers in that division between 2006 and 2013. Dawson rose to prominence on the world stage in 2007, when he defeated Tomasz Adamek to become the WBC light heavyweight champion. After vacating that title, he defeated Antonio Tarver in 2008 to win the IBF and IBO titles, and defeated him in a rematch in 2009.
Zsolt Erdei is a Hungarian former professional boxer who competed from 2000 to 2014. He held world championships in two weight classes, including the WBO and lineal light-heavyweight titles from 2004 to 2009, and the WBC cruiserweight title from 2009 to 2010. Erdei is the first boxer from Hungary to win world titles in two weight divisions. As an amateur, he won a bronze medal in the middleweight division at the 2000 Olympics. He also competed at the 1996 Summer Olympics.
Tomasz "Tomek" Adamek is a Polish former professional boxer who competed from 1999 to 2018. He held world championships in two weight classes, including the WBC light heavyweight title from 2005 to 2007, and the IBF and Ring magazine cruiserweight titles from 2008 to 2009. He also held the IBO cruiserweight title in 2007, and challenged once for the WBC heavyweight title in 2011. BoxRec ranks Adamek as the second best Polish boxer of all time, pound for pound. He is the first Polish boxer to win The Ring title.
Mike Tyson vs. Evander Holyfield, billed as Finally, was a professional boxing match fought between Evander Holyfield and Mike Tyson for the WBA heavyweight championship on November 9, 1996, at the MGM Grand Garden Arena in Paradise, Nevada. The bout was Tyson's first defense of the WBA title that he had won from Bruce Seldon on September 7 of that year.
Alfonso Ratliff is an American former professional boxer who competed from 1980 to 1989, holding the WBC and The Ring cruiserweight titles in 1985. He was later coaching at the Harvey Boxing Club in Harvey IL.
Bernard Benton is a retired American professional boxer in the Cruiserweight division who held the WBC and The Ring cruiserweight titles.
Dwain Bonds
Carlos De León 
Trevor Berbick 
Yaqui López 
Niua Tofaeono