John Callahan vs. Melvin Mercedes — Career Comparison

On the career pitching numbers, Melvin Mercedes posted a stronger line than John Callahan. Melvin Mercedes posted stronger numbers in ERA (0 vs 16.2) and WHIP (0.000 vs 3.000). By the career numbers, Melvin Mercedes 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.