John Callahan vs. Bill Freeman — Career Comparison

On the career pitching numbers, Bill Freeman posted a stronger line than John Callahan. Bill Freeman posted stronger numbers in ERA (14.54 vs 16.2) and WHIP (2.538 vs 3.000). By the career numbers, Bill Freeman 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.