Spencer Arrighetti vs. Rodrigo Lopez — Career Comparison

Looking at the career totals, Spencer Arrighetti and Rodrigo Lopez are fairly close on the surface numbers. Spencer Arrighetti had the edge in ERA (4.69 vs 4.82). By the career numbers, Spencer Arrighetti 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.