Gerardo Concepcion vs. Charlie Kerfeld — Career Comparison

On the career pitching numbers, Gerardo Concepcion posted a stronger line than Charlie Kerfeld. Gerardo Concepcion posted stronger numbers in ERA (3.86 vs 4.2) and WHIP (1.286 vs 1.572). By the career numbers, Gerardo Concepcion 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.