Bill Butler vs. Jack Killilay — Career Comparison

Looking at the career totals, Bill Butler and Jack Killilay are fairly close on the surface numbers. Jack Killilay posted stronger numbers in ERA (3.54 vs 4.21) and home runs allowed (0 per nine innings vs 0.99). Bill Butler had the advantage in WHIP (1.479 vs 1.656). By the career numbers, Jack Killilay 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.