15850
She upset Maria Kirilenko in the third round , but was defeated by fourth seed and eventual champion Serena Williams in the round of 16 , 6 – 0 , 6 – 0 .
 Maria Kirilenko, Serena Williams
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Maria Kirilenko, Serena Williams