Carl was a strong right-handed pitcher with an outstanding fastball and control. Carl was a good hitter and a versatile player in the field. He played junior with Norwood (1945) and Elmwood (1946, 1947), and then played with A.N.A.F. Vets in ManDak League, and senior ball with C.U.A.C., Selkirk, and St. Boniface. Carl played in many tournaments with the Winnipeg “Eagles.” Mattson also coached community club baseball in Norwood and Glenwood.