Theresa Kobuszewski [Koby or Tracy] (July 15, 1920 – March 22, 2005) was a pitcher who played from 1946 through 1947 in the All-American Girls Professional Baseball League.Born in Wyandotte, Michigan, Theresa Kobuszewski was a feary and respected underhand pitcher for fifteen years before joining the All-American Girls Professional Baseball League as a 26-year-old rookie in 1946.Kobuszewski played for the Keller Girls softball team at Mack Park, which was the original home field of Detroit's Negro National League franchise Detroit Stars, and then joined the Women's Army Corps (WAC) in 1942.