Hisashi Iwakuma vs. Roy Witherup — Career Comparison

Looking at the career totals, Hisashi Iwakuma and Roy Witherup are fairly close on the surface numbers. Hisashi Iwakuma posted stronger numbers in ERA (3.42 vs 4.44) and WHIP (1.158 vs 1.454). Roy Witherup had the advantage in home runs allowed (0.17 per nine innings vs 1.17). By the career numbers, Hisashi Iwakuma 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.