Willie Collazo vs. Kyle Keller — Career Comparison

Looking at the career totals, Willie Collazo and Kyle Keller are fairly close on the surface numbers. Kyle Keller posted stronger numbers in ERA (5.83 vs 6.35) and WHIP (1.554 vs 2.294). Willie Collazo had the advantage in home runs allowed (0 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.