Jack Aker vs. Joel Johnston — Career Comparison

Looking at the career totals, Jack Aker and Joel Johnston are fairly close on the surface numbers. Jack Aker posted stronger numbers in ERA (3.28 vs 4.31) and home runs allowed (0.77 per nine innings vs 1.05). Joel Johnston had the advantage in WHIP (1.296 vs 1.369). By the career numbers, Jack Aker 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.