23599
Karin Knapp and Mandy Minella were the defending champions but Knapp chose not to participate .
 Karin Knapp, Mandy Minella, Knapp
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Karin Knapp, Mandy Minella, Knapp