John Hibbard vs. Roberto Rivera — Career Comparison

On the career pitching numbers, John Hibbard posted a stronger line than Roberto Rivera. John Hibbard posted stronger numbers in ERA (2.65 vs 4.5) and home runs allowed (0.53 per nine innings vs 1.5). By the career numbers, John Hibbard 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.