Michael Spinks world Heavyweight champion in Las Vegas. 1979 saw Spinks get less than three minutes of boxing action inside a ring, with his only fight ending in a first round knockout of Marc Hans, but in 1980, Spinks took his ascent towards the top to another level, when he beat future IBF super-middleweight champion Murray Sutherland, David Conteh, and fringe contenders Ramon Ronquillo and Alvaro Yaqui Lopez (who challenged for a world title four times). Of his five wins that year, three came by knockout, Sutherland and Johnny Wilburn being the only ones who lasted the distance. By 1981, Spinks was
Leon Spinks vs. Muhammad Ali II holding. The Associated Press scored the fight 12-3 for Ali, while the three judges had the bout 11-4, 10-4 and 10-4 all in favor of Ali giving him a Unanimous decision win. Ali regained the WBA heavyweight title and avenged his split decision loss to Spinks from seven months prior. He also became the first man to win the World Heavyweight Championship three times. In June 1979, Ali sent an official letter of retirement to the WBA. Promoter Bob Arum said he paid Ali $300,000 to announce his retirement because Ali's reluctance had delayed the scheduling of a fight between