Michael "Jinx" 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 Montreal.
Leon Spinks (RIP: February 5, 2021) 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. He did challenge once more for the WBC heavyweight title in 1981 (losing to Larry Holmes by TKO in the third round), and the WBA cruiserweight title in 1986 (losing to Dwight Muhammad Qawi by TKO in the sixth round).