John Callahan vs. Diego Moreno — Career Comparison

On the career pitching numbers, Diego Moreno posted a stronger line than John Callahan. Diego Moreno posted stronger numbers in ERA (5.06 vs 16.2) and WHIP (1.250 vs 3.000). By the career numbers, Diego Moreno 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.