Jamie Callahan vs. Mike Willis — Career Comparison

On the career pitching numbers, Jamie Callahan posted a stronger line than Mike Willis. Jamie Callahan posted stronger numbers in ERA (4.05 vs 4.59) and WHIP (1.200 vs 1.524). 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.