Jim Mann vs. Isidro Marquez — Career Comparison

On the career pitching numbers, Jim Mann posted a stronger line than Isidro Marquez. Jim Mann posted stronger numbers in ERA (4.83 vs 6.75) and WHIP (1.484 vs 1.650). By the career numbers, Jim Mann 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.