Jim Peterson vs. Mark Williamson — Career Comparison

On the career pitching numbers, Mark Williamson posted a stronger line than Jim Peterson. Mark Williamson posted stronger numbers in ERA (3.86 vs 5.27) and WHIP (1.418 vs 1.665). By the career numbers, Mark Williamson 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.