Andy Messersmith vs. Bill Williams — Career Comparison

On the career pitching numbers, Andy Messersmith posted a stronger line than Bill Williams. Andy Messersmith posted stronger numbers in ERA (2.86 vs 5.06) and WHIP (1.163 vs 1.313). By the career numbers, Andy Messersmith 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.