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Grönefeld partnered with Cara Black , but Navratilova and partner Nadia Petrova defeated them 6 – 1 , 6 – 2 in the final .
 Grönefeld, Cara Black, Navratilova, Nadia Petrova
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Grönefeld, Cara Black, Navratilova, Nadia Petrova