George Foreman

George Foreman's 76-5 record with 68 knockouts features one of boxing's most remarkable comebacks, including reclaiming the heavyweight title at age 45 in 1994—10 years older than the typical titleholder. His 1973 demolition of Joe Frazier, winning by two first-round knockdowns, was 30% faster than Muhammad Ali's 1974 victory over Foreman based on time-to-win metrics. Foreman's knockout ratio of 89.5% places him second only to Mike Tyson among heavyweights with 50+ wins; his return to glory after a ten-year hiatus remains unmatched in modern boxing history.