Unknown Blackburn vs. Carson Spiers — Career Comparison

On the career pitching numbers, Unknown Blackburn posted a stronger line than Carson Spiers. Unknown Blackburn posted stronger numbers in ERA (0.9 vs 5.69) and WHIP (1.000 vs 1.573). By the career numbers, Unknown Blackburn 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.