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In the third round she easily took care of 18th seed Andrea Petkovic in straight sets for her first win over a seeded player at a grand slam since 2012 .
 Andrea Petkovic
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Andrea Petkovic