George Keefe vs. John Mackinson — Career Comparison

On the career pitching numbers, George Keefe posted a stronger line than John Mackinson. George Keefe posted stronger numbers in ERA (5.05 vs 7.36) and home runs allowed (0.29 per nine innings vs 1.23). By the career numbers, George Keefe 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.