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Mike Tyson
Mike Tyson turned pro in 1985 and, on November 22, 1986, knocked out Trevor Berbick to win the WBC heavyweight title at 20 years and 4 months old, becoming the youngest heavyweight champion in boxing history — a record that still stands nearly four decades later. Tyson went on to unify the heavyweight championship in 1987, holding the WBA, WBC, and IBF titles simultaneously, and built a reputation as one of the most feared punchers the division has ever seen, winning his first 19 professional fights by knockout, 12 of them in the first round. His stunning 1990 upset loss to underdog Buster Douglas in Tokyo, after Tyson had appeared unbeatable for years, remains one of the biggest shocks in boxing history, and his career afterward was shaped as much by legal and personal controversies — including a 1992 rape conviction and a 1997 disqualification for biting Evander Holyfield's ear — as by his in-ring results. Tyson's combination of knockout power, speed for a heavyweight, and sheer intimidation redefined what fans expected from a heavyweight champion during his early run, and even with a career that never fully recovered its peak form after the Douglas loss, his early 1986-1990 stretch is still cited as one of the most dominant runs any heavyweight has ever produced.
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Floyd Mayweather Jr.
Floyd Mayweather Jr. turned pro in 1996 and retired in 2017 with a perfect 50-0 record, becoming just the fourth boxer in history to retire completely undefeated at that professional level of competition, closing out a career built far more around defensive precision than the highlight-reel knockouts most boxing stars are remembered for. Mayweather won world titles in five different weight classes, from super featherweight up to light middleweight, a range of divisions that reflects both his longevity and his ability to adapt his style against bigger opponents as his career progressed rather than staying locked into a single weight class. His 2015 fight against Manny Pacquiao generated the highest pay-per-view revenue in boxing history at the time, and his 2017 exhibition-style bout against UFC star Conor McGregor became the second-highest-grossing pay-per-view event ever — Mayweather's ability to draw record commercial numbers even outside a traditional boxing matchup became as central to his legacy as the undefeated record itself. Nicknamed "Money" for both his fighting style's calculated caution and his outsized off-camera persona, Mayweather's defense-first approach — built on distance control, a tight guard, and a willingness to avoid unnecessary risk — drew criticism from fans wanting more aggression, but it's also the exact approach that let him leave the sport with a career record no opponent ever beat.
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