Jonathan Aro vs. Frank Keffer — Career Comparison

On the career pitching numbers, Frank Keffer posted a stronger line than Jonathan Aro. Frank Keffer posted stronger numbers in ERA (5.63 vs 6.55) and WHIP (1.500 vs 1.909). By the career numbers, Frank Keffer 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.