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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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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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