John Perkovich vs. Jeff Zimmerman — Career Comparison

On the career pitching numbers, Jeff Zimmerman posted a stronger line than John Perkovich. Jeff Zimmerman posted stronger numbers in ERA (3.27 vs 7.2) and WHIP (1.120 vs 1.600). By the career numbers, Jeff Zimmerman 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.