Dan Dumoulin vs. Ron Keller — Career Comparison

Looking at the career totals, Dan Dumoulin and Ron Keller are fairly close on the surface numbers. Ron Keller posted stronger numbers in ERA (3.38 vs 7.84) and WHIP (1.453 vs 2.613). Dan Dumoulin had the advantage in home runs allowed (0 per nine innings vs 1.27). By the career numbers, Ron Keller 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.