Roy Mitchell vs. Bill Williams — Career Comparison

On the career pitching numbers, Roy Mitchell posted a stronger line than Bill Williams. Roy Mitchell posted stronger numbers in ERA (3.42 vs 5.06) and home runs allowed (0.19 per nine innings vs 1.69). By the career numbers, Roy Mitchell 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.