Jonathan Aro vs. Rafael Montalvo — Career Comparison

Looking at the career totals, Jonathan Aro and Rafael Montalvo are fairly close on the surface numbers. Jonathan Aro posted stronger numbers in ERA (6.55 vs 9) and WHIP (1.909 vs 3.000). Rafael Montalvo had the advantage in home runs allowed (0 per nine innings vs 1.64). By the career numbers, Jonathan Aro 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.