Unknown Lester vs. Fred Mitchell — Career Comparison

On the career pitching numbers, Unknown Lester posted a stronger line than Fred Mitchell. Unknown Lester posted stronger numbers in ERA (2.57 vs 4.1) and WHIP (1.000 vs 1.544). By the career numbers, Unknown Lester 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.