Willie Collazo vs. Mark Kiefer — Career Comparison

Looking at the career totals, Willie Collazo and Mark Kiefer are fairly close on the surface numbers. Mark Kiefer posted stronger numbers in ERA (4.29 vs 6.35) and WHIP (1.481 vs 2.294). Willie Collazo had the advantage in home runs allowed (0 per nine innings vs 1.24). By the career numbers, Mark Kiefer 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.