Seth Halvorsen vs. Tom Johnson — Career Comparison

On the career pitching numbers, Tom Johnson posted a stronger line than Seth Halvorsen. Tom Johnson posted stronger numbers in ERA (3.39 vs 4.15) and home runs allowed (0.63 per nine innings vs 1.56). By the career numbers, Tom Johnson 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.