List of world heavyweight boxing champions

World Heavyweight ChampionList of heavyweight boxing championsheavyweight championworld heavyweight championshipWorld Heavyweight Boxing Championworld heavyweight titleheavyweight championshipheavyweight boxing championHeavyweight Champion of the WorldWorld heavyweight boxing championship
Champions were recognized by public acclamation.wikipedia
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Mike Tyson vs. Michael Spinks

Jun 27, 1988Tyson–Spinks fight91-second Knockout
Both men were undefeated and each had a claim to being the legitimate heavyweight champion.

Ken Norton

Norton
In 1974, Norton fought George Foreman for the world heavyweight championship and was knocked out in the second round at the Poliedro de Caracas in Caracas, Venezuela.

Sonny Liston

ListonCharles "Sonny" ListonPariah: The Lives and Deaths of Sonny Liston
He returned with four consecutive knockout victories in Sweden between July 1966 and April 1967, all four co-promoted by former world heavyweight champion Ingemar Johansson.

Karl Mildenberger

He unsuccessfully challenged Muhammad Ali for the World Heavyweight Title in September 1966.