Robbie Erlin vs. Bill Williams — Career Comparison

On the career pitching numbers, Robbie Erlin posted a stronger line than Bill Williams. Robbie Erlin posted stronger numbers in ERA (4.87 vs 5.06) and home runs allowed (1.13 per nine innings vs 1.69). By the career numbers, Robbie Erlin 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.