Kyle Keller vs. John Mackinson — Career Comparison

Looking at the career totals, Kyle Keller and John Mackinson are fairly close on the surface numbers. Kyle Keller posted stronger numbers in ERA (5.83 vs 7.36) and WHIP (1.554 vs 1.773). John Mackinson had the advantage in home runs allowed (1.23 per nine innings vs 2.33). By the career numbers, Kyle Keller 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.