Evander Holyfield
As an amateur, Holyfield represented the United States at the 1984 Summer Olympics, winning a bronze medal in the light heavyweight division. He turned professional at the age of 21, moving up to cruiserweight in 1985 and winning his first world championship the following year, defeating Dwight Muhammad Qawi for the WBA title. Holyfield then went on to defeat Ricky Parkey and Carlos de León to win the WBC and IBF titles, thus becoming the undisputed cruiserweight champion. He moved up to heavyweight in 1988, later defeating Buster Douglas in 1990 to claim the unified WBA, WBC and IBF heavyweight titles and the undisputed heavyweight championship.
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