Bob Blewett vs. John Callahan — Career Comparison

On the career pitching numbers, Bob Blewett posted a stronger line than John Callahan. Bob Blewett posted stronger numbers in ERA (4.82 vs 16.2) and WHIP (1.643 vs 3.000). By the career numbers, Bob Blewett 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.