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Her winning percentage of 94 % was the best since Steffi Graf 's 1995 season ( Serena Williams surpassed her in 2013 with 95 % ) .
 Steffi Graf, 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:
 Steffi Graf, Serena Williams