Leo Mangum vs. John Valentine — Career Comparison

On the career pitching numbers, John Valentine posted a stronger line than Leo Mangum. John Valentine posted stronger numbers in ERA (3.53 vs 5.37) and WHIP (1.441 vs 1.606). By the career numbers, John Valentine 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.