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In only his eighth professional fight , he won the undisputed heavyweight championship in 1978 after defeating Muhammad Ali in a split decision , in what was considered one of the biggest upsets in boxing history .
 person: Muhammad Ali
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: Muhammad Ali