We have several now. If your talking about who was the last undisputed White Heavyweight Champion, Ingemar Johansson was. If your talking about the last undisputed White American Heavyweight Champion, then the answer is Rocky Marciano.
John cena but he changed the style of the belt.
Since the glove era, John L. Sullivan was the 1st. He was also the last bareknuckle Heavyweight Champion as well.
Leon Spinks (former heavyweight champion of the world)
If you're referring to it becoming Undisputed Championship, then it's Steve Austin.
· Jack Dempsey (boxing heavyweight champion of the world 1919-1926)
The Undertaker won after doing the last ride to Rey Mysterio retaining the World Heavyweight Champion.
yes he was a 10 time wwe champion he was also a 2 time u.s. champion he was also was a 1 time world heavyweight champion and last he was a 2 time tag team champion by trevor smith
Arthur Ashe, Tennis Player, Open and Wimbledon champion Hank Aaron, Hall of Fame baseball player Muhammad Ali, former heavyweight champion boxer
John Lawrence Sullivan, also known as the Boston Strong Boy, is known for being the first Heavyweight Champion of gloved boxing from 1882 to 1892. He is also recognized as the last heavyweight champion of bare-knuckle boxing under the London Prize Ring Rules.
Jersey Joe Walcott was the heavyweight boxing champion of the world. He was 37 years old when he won the title.
"Undisputed" means you hold all of the 4 major sanctioning bodies titles at the same time (WBC, WBA, IBF and WBO). "Linear" means that you hold beat the champion who was last undisputed, but had titles taken away from sanctioning bodies for not paying the fee to the sanctioning body or not facing their determined #1 contender. "Interim" refers to someone who wins a title without beating the current champion. this happens when a champion is injured and cannot defend his title for a long period of time, and is then stripped of his belt.