Jimmy Anderson vs. Willie Jefferson — Career Comparison

On the career pitching numbers, Willie Jefferson posted a stronger line than Jimmy Anderson. Willie Jefferson posted stronger numbers in ERA (3.94 vs 5.42) and WHIP (1.314 vs 1.629). By the career numbers, Willie Jefferson 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.