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Kim Clijsters was the defending champion , but retired due to a left wrist sprain in the second round against Stéphanie Dubois .
 Kim Clijsters, Stéphanie Dubois
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kim Clijsters, Stéphanie Dubois