Willie Collazo vs. Billy Koch — Career Comparison

Looking at the career totals, Willie Collazo and Billy Koch are fairly close on the surface numbers. Billy Koch posted stronger numbers in ERA (3.89 vs 6.35) and WHIP (1.466 vs 2.294). Willie Collazo had the advantage in home runs allowed (0 per nine innings vs 0.91). By the career numbers, Billy Koch 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.