Muhammad Ali vs Mike Tyson

Muhammad Ali was a heavyweight champion across three separate reigns (1964-1967, 1974-1978, 1978-1979) with a 56-5 record, while Mike Tyson became the youngest heavyweight champion at age 20 with a 50-6 record. Ali dominated the 1960s-1970s with superior boxing technique and longevity, while Tyson dominated the late 1980s with unmatched raw power and speed.