Roy Heiser vs. Slim McGrew — Career Comparison

Looking at the career totals, Roy Heiser and Slim McGrew are fairly close on the surface numbers. Slim McGrew posted stronger numbers in WHIP (1.900 vs 2.647) and home runs allowed (0.3 per nine innings vs 1.59). Roy Heiser had the advantage in ERA (6.35 vs 6.6). By the career numbers, Slim McGrew 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.