Matt Mantei vs. John Valentine — Career Comparison

On the career pitching numbers, John Valentine posted a stronger line than Matt Mantei. John Valentine posted stronger numbers in ERA (3.53 vs 4.07) and home runs allowed (0 per nine innings vs 0.84). 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.