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The rematch would be held on November 13 , 1999 , exactly six years after Riddick Bowe had defeated Holyfield to become the last Undisputed Heavyweight champion .
 Riddick Bowe, Holyfield
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Riddick Bowe, Holyfield