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Liezel Huber ( née Horn ; born 21 August 1976 , Durban , South Africa ) is a professional tennis player from the United States , having been a naturalized American citizen since July 2007 .
 Liezel Huber, Durban, South Africa, United States
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Liezel Huber, Durban, South Africa, United States