Mark Mercer vs. Arnold Umbach — Career Comparison

On the career pitching numbers, Arnold Umbach posted a stronger line than Mark Mercer. Arnold Umbach posted stronger numbers in ERA (3.12 vs 4.7) and WHIP (1.551 vs 1.826). By the career numbers, Arnold Umbach 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.