9517
He became one of just three pitchers to reach that milestone in their first seven seasons , joining Tom Seaver and Bert Blyleven .
 Tom Seaver, Bert Blyleven
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Tom Seaver, Bert Blyleven