Jonathan Aro vs. George Diehl — Career Comparison

On the career pitching numbers, George Diehl posted a stronger line than Jonathan Aro. George Diehl posted stronger numbers in ERA (3.52 vs 6.55) and WHIP (1.435 vs 1.909). By the career numbers, George Diehl 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.