Alek Jacob vs. Bill Mack — Career Comparison

Looking at the career totals, Alek Jacob and Bill Mack are fairly close on the surface numbers. Bill Mack posted stronger numbers in ERA (3 vs 4.06) and WHIP (1.000 vs 1.216). Alek Jacob had the advantage in home runs allowed (1.24 per nine innings vs 1.5). By the career numbers, Bill Mack 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.