Which boxer became the first world champion in three different weight classes?

Fact

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Bob Fitzsimmons is widely recognized as the first boxer to win world titles in three different weight classes: middleweight, light heavyweight, and heavyweight. That achievement came decades before Sugar Ray Leonard and many other multi-division champions, making Fitzsimmons a true pioneer in boxing history. He achieved the three championships between 1891 and 1903, when boxing’s weight divisions and title structures differed from today’s.