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Joseph William Frazier, nicknamed "Smokin' Joe", was an American professional boxer who competed from 1965 to 1981. Widely regarded as one of the greatest heavyweight boxers of all time, he was known for his strength, durability, formidable left hand, and relentless pressure fighting style and was the first boxer to defeat Muhammad Ali. Frazier won a gold medal at the 1964 Summer Olympics as an amateur, held the NYSAC heavyweight title from 1968 to 1973, and was the undisputed heavyweight champion from 1970 to 1973. Frazier emerged as the top contender in the late 1960s, becoming undisputed heavyweight champion in 1970. In 1971, he defeated Ali by unanimous decision in the highly anticipated Fight of the Century. Two years later, Frazier lost his title to George Foreman. Frazier's last world title challenge came in 1975, but he was beaten by Ali in the brutal rubber match, the Thrilla in Manila. Frazier retired in 1976 after a second loss to Foreman but made a comeback in 1981, before retiring for good with a record of 32 wins, 4 losses, and 1 draw. The International Boxing Research Organization rates Frazier among the ten greatest heavyweights of all time. The Ring magazine named him Fighter of the Year in 1967, 1970, and 1971, and the Boxing Writers Association of America (BWAA) named him Fighter of the Year in 1969, 1971, and 1975. In 1999, The Ring ranked him the eighth greatest heavyweight. He is an inductee of both the International Boxing Hall of Fame and the World Boxing Hall of Fame, having been a part of the inaugural induction class of 1990 for the IBHF. His style was often compared with that of Henry Armstrong and occasionally Rocky Marciano and was dependent on bobbing, weaving, and relentless pressure to wear down his opponents. His best-known punch was a powerful left hook, which accounted for most of his knockouts. In his career, he lost to only two fighters, both former Olympic and world heavyweight champions: twice to Muhammad Ali and twice to George Foreman. Frazier continued to train fighters in his gym in Philadelphia. His attitude towards Ali in later life was largely characterized by bitterness and contempt but was interspersed with brief reconciliations.