Because of his ability to fight both at junior middleweight and middleweight, fans began to talk about the possibility of him challenging either world light middleweight champion Hearns or world middleweight champion Hagler. Despite Mugabi being a mandatory contender for some time, a Hearns - Mugabi title match never materialised, as Hearns elected to move to Middleweight to challenge Marvelous Marvin Hagler. Considering his streak and Hagler's tough battle with Hearns on April 15, 1985, some felt Mugabi had a shot at doing what eleven men before him could not: wresting Hagler's undisputed world middleweight title from him. On March 10, 1986, Marvin ‘Marvelous’ Hagler rose to a very stiff challenge. A young, undefeated powerhouse was destroying every opponent in his path. John ‘The Beast’ Mugabi had won all of his contests by knockout—many spectacular; many in the first few rounds of the fight. He possessed incredible knockout power and provided the boxing world with an epic encounter.