Gregg Olson vs. John Perkovich — Career Comparison

On the career pitching numbers, Gregg Olson posted a stronger line than John Perkovich. Gregg Olson posted stronger numbers in ERA (3.46 vs 7.2) and WHIP (1.442 vs 1.600). By the career numbers, Gregg Olson 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.