Greg Bollo vs. John Mackinson — Career Comparison

Looking at the career totals, Greg Bollo and John Mackinson are fairly close on the surface numbers. Greg Bollo posted stronger numbers in ERA (3.34 vs 7.36) and WHIP (1.079 vs 1.773). John Mackinson had the advantage in home runs allowed (1.23 per nine innings vs 1.52). By the career numbers, Greg Bollo 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.