Zack Greinke vs. Don Kirkwood — Career Comparison

Looking at the career totals, Zack Greinke and Don Kirkwood are fairly close on the surface numbers. Zack Greinke posted stronger numbers in ERA (3.49 vs 4.37) and WHIP (1.178 vs 1.497). Don Kirkwood had the advantage in home runs allowed (0.72 per nine innings vs 0.97). By the career numbers, Zack Greinke 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.