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During his junior tennis careerhe won both the singles and doubles competitions at the USTA Boys 16 & 18 National Championships in Kalamazoo , Michigan , as well as winning other national titles in the 12 & 14 year old divisions .
 Kalamazoo , Michigan
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kalamazoo , Michigan