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The tournament included four players who were ranked in the top 20 : Agnieszka Radwańska ; Marion Bartoli , the 2009 Brisbane runner-up ; Flavia Pennetta , the 2009 Acapulco runner-up ; and Zheng Jie .
 Agnieszka Radwańska, Marion Bartoli, Flavia Pennetta, Zheng Jie
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Agnieszka Radwańska, Marion Bartoli, Flavia Pennetta, Zheng Jie