Jack Aker vs. Fred Hahn — Career Comparison

Looking at the career totals, Jack Aker and Fred Hahn are fairly close on the surface numbers. Fred Hahn posted stronger numbers in ERA (0 vs 3.28) and home runs allowed (0 per nine innings vs 0.77). Jack Aker had the advantage in WHIP (1.369 vs 1.500). By the career numbers, Fred Hahn 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.