Jonathan Aro vs. Frank Mack — Career Comparison

On the career pitching numbers, Frank Mack posted a stronger line than Jonathan Aro. Frank Mack posted stronger numbers in ERA (4.94 vs 6.55) and WHIP (1.732 vs 1.909). By the career numbers, Frank 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.