Johnny Hetki vs. Michael Petersen — Career Comparison

On the career pitching numbers, Johnny Hetki posted a stronger line than Michael Petersen. Johnny Hetki posted stronger numbers in ERA (4.39 vs 5.02) and WHIP (1.412 vs 1.593). By the career numbers, Johnny Hetki 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.