Jonathan Papelbon vs. Zack Weiss — Career Comparison

On the career pitching numbers, Jonathan Papelbon posted a stronger line than Zack Weiss. Jonathan Papelbon posted stronger numbers in ERA (2.44 vs 4.61) and WHIP (1.068 vs 1.280). By the career numbers, Jonathan Papelbon 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.