9930
She would lose to Serena Williams in the semifinals in three sets despite serving for the match in the third set and leading 4 – 1 in the third set tiebreak .
 Serena Williams
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Serena Williams