Jamie Callahan vs. Mike Perez — Career Comparison

Looking at the career totals, Jamie Callahan and Mike Perez are fairly close on the surface numbers. Jamie Callahan posted stronger numbers in WHIP (1.200 vs 1.376) and home runs allowed (0 per nine innings vs 0.68). Mike Perez had the advantage in ERA (3.56 vs 4.05). By the career numbers, Jamie Callahan 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.