In combat sports where champions are decided by a challenge, the lineal championship in a weight class represents an intangible world title initially held by the victor of a bout between top contenders in the division, as commonly interpreted. An alternative, less mainstream perspective suggests that vacancies in divisional championships can only be filled by an undisputed champion. A fighter who defeats the reigning champion in a match within that weight class becomes the next lineal champion. In professional boxing, the informal term for the lineal champion is "the man who beat the man."
Muhammad Ali is the only three-time lineal heavyweight champion in the history of boxing
John L. Sullivan, the first lineal champion, came to welcome his successor, Jack Johnson. Ever since, it has been a tradition for champions of the past to attend title fights of recent champions, essentially to "pass the torch" and legitimize their reign.[citation needed]
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.
Lewis in 2010
Lewis in 2008