Alberto Castillo vs. Edwin Diaz — Career Comparison

On the career pitching numbers, Edwin Diaz posted a stronger line than Alberto Castillo. Edwin Diaz posted stronger numbers in ERA (2.82 vs 4.33) and WHIP (1.053 vs 1.541). By the career numbers, Edwin Diaz 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.