Santiago Casilla vs. Mutt Williams — Career Comparison

Looking at the career totals, Santiago Casilla and Mutt Williams are fairly close on the surface numbers. Santiago Casilla had the edge in ERA (3.29 vs 4.91). By the career numbers, Santiago Casilla 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.