Christian Bergman vs. Roger Nelson — Career Comparison

On the career pitching numbers, Roger Nelson posted a stronger line than Christian Bergman. Roger Nelson posted stronger numbers in ERA (3.06 vs 5.59) and WHIP (1.127 vs 1.493). By the career numbers, Roger Nelson 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.