Muhammad Ali vs Ken Norton III
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Having knocked out George Foreman to become champion for the second time in 1974, Muhammad Ali was on top of the world and the greatest boxer of all time in most people's mind. The following year he stopped Joe Frazier in one of the most brutal fights in boxing history, but there was still one rival that had beaten him, Ken Norton. His victory over Norton in their 1973 rematch was not enough for Ali and the build-up to this fight was that Ken Norton would get knocked out.
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Their records at the time
Muhammad Ali: 52-2
Ken Norton: 37-3