Ron Keller vs. William Parson — Career Comparison

Looking at the career totals, Ron Keller and William Parson are fairly close on the surface numbers. Ron Keller posted stronger numbers in ERA (3.38 vs 4.92) and WHIP (1.453 vs 1.856). William Parson had the advantage in home runs allowed (0.6 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.