Aaron Heilman vs. Walter Thornton — Career Comparison

Looking at the career totals, Aaron Heilman and Walter Thornton are fairly close on the surface numbers. Walter Thornton posted stronger numbers in ERA (4.18 vs 4.4) and home runs allowed (0.26 per nine innings vs 1.03). Aaron Heilman had the advantage in WHIP (1.402 vs 1.537). By the career numbers, Walter Thornton 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.