Alberto Arias vs. Mark Mercer — Career Comparison

On the career pitching numbers, Alberto Arias posted a stronger line than Mark Mercer. Alberto Arias posted stronger numbers in ERA (3.74 vs 4.7) and WHIP (1.580 vs 1.826). By the career numbers, Alberto Arias 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.