Tom Acker vs. Casey Janssen — Career Comparison

On the career pitching numbers, Casey Janssen posted a stronger line than Tom Acker. Casey Janssen posted stronger numbers in ERA (3.63 vs 4.12) and WHIP (1.238 vs 1.407). By the career numbers, Casey Janssen 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.