Grant Jackson vs. John Perkovich — Career Comparison

On the career pitching numbers, Grant Jackson posted a stronger line than John Perkovich. Grant Jackson posted stronger numbers in ERA (3.46 vs 7.2) and WHIP (1.365 vs 1.600). By the career numbers, Grant Jackson 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.