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Muhammad Ali
Muhammad Ali, born Cassius Clay, won Olympic gold as a light heavyweight at the 1960 Rome Games before turning pro and building a case, across a nearly 21-year career, as the most consequential heavyweight boxer in history — a three-time heavyweight champion whose in-ring career was as defined by what happened outside the ring as inside it. Ali refused induction into the US military in 1967 on religious and conscientious-objector grounds during the Vietnam War, a stance that cost him his boxing license and his heavyweight title, and kept him out of the ring during more than three years of his athletic prime. The Supreme Court overturned his conviction in 1971, and Ali returned to reclaim the title twice more. His two most famous fights came against George Foreman and Joe Frazier: the 1974 "Rumble in the Jungle" in Kinshasa, Zaire, where Ali used his "rope-a-dope" strategy to absorb Foreman's power before knocking him out in the eighth round, and the 1975 "Thrilla in Manila," a brutal third fight against Frazier that both men later described as the closest either had come to death in the ring. Ali's combination of speed, showmanship, and outspoken political conviction, at real personal cost during a genuinely hostile period of American public opinion, made him a cultural figure that extended well past boxing — "The Greatest" is a nickname he gave himself early in his career, and one that's stuck as a fair description ever since.
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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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