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His fastball , tight slider and nasty forkball contributed to impressive pitching statistics , distinguishing himself as one of the American League 's top right-handed starting pitchers throughout much of the 1990 s .
 American League
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 American League