Ernesto Frieri vs. John Mackinson — Career Comparison

On the career pitching numbers, Ernesto Frieri posted a stronger line than John Mackinson. Ernesto Frieri posted stronger numbers in ERA (3.59 vs 7.36) and WHIP (1.279 vs 1.773). By the career numbers, Ernesto Frieri 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.