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Rocky Marciano
Rocky Marciano turned pro in 1947 and, across a six-year career as heavyweight champion, became the only heavyweight titleholder in boxing history to retire completely undefeated, finishing his career 49-0 with 43 wins by knockout — a perfect record that's never been matched by any other heavyweight champion before or since. Marciano won the title in 1952 by knocking out Jersey Joe Walcott in the 13th round of a fight he was losing on the scorecards, a come-from-behind knockout that's remembered as one of the most dramatic single punches in heavyweight title history. He defended the title six times, including a rematch win over Walcott and a 1951 win over an aging Joe Louis that effectively ended Louis's career, before announcing his retirement in 1956 at 31, still at the height of his powers rather than fading out through a series of late-career losses. Marciano's knockout percentage — 43 of his 49 career wins came inside the distance — combined with his perfect record makes him a standing reference point whenever boxing historians debate the sport's most devastating punchers, a rare case of a heavyweight remembered as both statistically unbeaten and genuinely feared.
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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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