Jonathan Aro vs. Unknown McDoolan — Career Comparison

Looking at the career totals, Jonathan Aro and Unknown McDoolan are fairly close on the surface numbers. Unknown McDoolan posted stronger numbers in ERA (3 vs 6.55) and home runs allowed (0 per nine innings vs 1.64). Jonathan Aro had the advantage in WHIP (1.909 vs 2.000). By the career numbers, Unknown McDoolan 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.