Callahan (99-73 career record) has earned a 3.39 ERA and has surrendered 9.8 hits per 9 innings. His K/BB ratio is 1.02 and he has gone up against 6,855 batters during his career. During his career, Callahan has conceded 1,748 hits while he has tallied 445 strikeouts in 1,603 innings pitched. He has allowed 603 earned runs while holding a WHIP of 1.363 and a FIP of 3.3.
