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.

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."