Hallahan (102-94 career record) is the owner of a FIP of 3.97 and he has gone up against 7,624 batters during his time in the majors. His ERA is 4.03 (779 earned runs allowed) and he has a career WHIP of 1.504. He has conceded 1,838 hits (9.5 hits per nine innings) and has 779 walks. Hallahan has taken the mound for 1,740 innings and has earned 856 K’s thus far in his career.