Ben Callahan vs. George O'Donnell — Career Comparison

Looking at the career totals, Ben Callahan and George O'Donnell are fairly close on the surface numbers. George O'Donnell posted stronger numbers in ERA (4.53 vs 12.54) and WHIP (1.443 vs 2.571). Ben Callahan had the advantage in home runs allowed (0 per nine innings vs 0.41). By the career numbers, George O'Donnell had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.