His only loss in three years as an amateur was to Buster Mathis .
During Frazier 's amateur career , he won Golden Gloves Heavyweight Championships in 1962 , 1963 and 1964 .
Frazier 's only loss in three years as an amateur was to Buster Mathis .
During Frazier 's amateur career , he won Golden Gloves Heavyweight Championships in 1962 , 1963 and 1964 .