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Having turned professional the next year , he won the world heavyweight title with a second-round knockout of then-undefeated Joe Frazier in 1973 .
 person: Joe Frazier
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 person: Joe Frazier