Bill Butler vs. Izzy Leon — Career Comparison

Looking at the career totals, Bill Butler and Izzy Leon are fairly close on the surface numbers. Bill Butler posted stronger numbers in ERA (4.21 vs 5.35) and WHIP (1.479 vs 1.759). Izzy Leon had the advantage in home runs allowed (0.7 per nine innings vs 0.99). By the career numbers, Bill Butler 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.