Tim Birtsas vs. John Mackinson — Career Comparison

On the career pitching numbers, Tim Birtsas posted a stronger line than John Mackinson. Tim Birtsas posted stronger numbers in ERA (4.08 vs 7.36) and WHIP (1.564 vs 1.773). By the career numbers, Tim Birtsas 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.