Over time he became a favorite of American TV networks, scoring sensational knockouts of contenders such as Curtis Ramsey, Gary Guiden, former world champion Eddie Gazo, Curtis Parker, Frank The Animal Fletcher, Nino Gonzalez and Earl Hargrove.
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Showing resilience, Mugabi resurfaced with two more wins and once again found himself fighting for a world title, facing Gerald McClellan on November 20, 1991 in London for the vacant WBO middleweight championship.
In defeat, Singer made history by becoming the first man, and only man up until John Mugabi, to both win and lose the title by knockout in the first round.
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March 10- Marvin Hagler retains his undisputed world Middleweight title with an eleventh round knockout of John Mugabi, Thomas Hearns wins the NABF Middleweight title with a first round knockout of James Shuler, and Gaby Canizales wins the WBA world Bantamweight title with a seventh round knockout of Richie Sandoval, who was critically injured and almost died in the days after the fight.