Luis Castillo vs. Michael Kopech — Career Comparison

Looking at the career totals, Luis Castillo and Michael Kopech are fairly close on the surface numbers. Michael Kopech posted stronger numbers in ERA (4.14 vs 5.06) and WHIP (1.333 vs 1.969). Luis Castillo had the advantage in home runs allowed (0 per nine innings vs 1.45). By the career numbers, Michael Kopech 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.