10 Mar 1986
Marvin Hagler beats John Mugabi via knockout 11/12
Middleweight (160 lb)
5 Dec 1986
Duane Thomas beats John Mugabi via knockout 3/12
Super Welterweight (154 lb)
8 Jul 1989
John Mugabi beats Rene Jacquot via knockout 1/12
John Mugabi becomes the WBC Super Welterweight world champion
31 Mar 1990
Terry Norris beats John Mugabi via knockout 1/12
20 Nov 1991
Gerald McClellan beats John Mugabi via knockout 1/12