John Costello vs. Martin Glendon — Career Comparison

On the career pitching numbers, Martin Glendon posted a stronger line than John Costello. Martin Glendon posted stronger numbers in ERA (2.05 vs 2.97) and WHIP (1.174 vs 1.395). By the career numbers, Martin Glendon 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.