The Philadelphia Phillies selected Frohwirth in the 13th round (335th overall) of the 1984 Major League Baseball draft.
Frohwirth began the 1987 season in Minor League Baseball (MiLB),with the Double-A Eastern League (EL) Reading Phillies and was leading the league with 16 saves when he was promoted to the Triple-A Maine Guides of the International League (IL),on June 29,1987.
On August 10,1987,the Phillies promoted Frohwirth to the big leagues,when he made his MLB debut. Frohwirth entered the game in the fifth inning,when Phillies teammate Kevin Gross was caught with an illegal substance (sandpaper) in his glove,and was ejected. [1] Frohwirth pitched an effective 1