Dan Dumoulin vs. Ron Willis — Career Comparison

Looking at the career totals, Dan Dumoulin and Ron Willis are fairly close on the surface numbers. Ron Willis posted stronger numbers in ERA (3.32 vs 7.84) and WHIP (1.544 vs 2.613). Dan Dumoulin had the advantage in home runs allowed (0 per nine innings vs 0.57). By the career numbers, Ron Willis 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.