Mark Leiter vs. Michael Mercado — Career Comparison

On the career pitching numbers, Mark Leiter posted a stronger line than Michael Mercado. Mark Leiter posted stronger numbers in ERA (4.57 vs 11.81) and WHIP (1.412 vs 2.250). By the career numbers, Mark Leiter 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.