Fred Hayner vs. Jesen Therrien — Career Comparison

On the career pitching numbers, Jesen Therrien posted a stronger line than Fred Hayner. Jesen Therrien posted stronger numbers in ERA (8.35 vs 13.5) and WHIP (1.691 vs 3.000). By the career numbers, Jesen Therrien 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.