Unknown Haley vs. Mark Prior — Career Comparison

On the career pitching numbers, Mark Prior posted a stronger line than Unknown Haley. Mark Prior posted stronger numbers in ERA (3.51 vs 13.5) and WHIP (1.240 vs 2.167). By the career numbers, Mark Prior 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.