Juan Mateo vs. Bill Williams — Career Comparison

Looking at the career totals, Juan Mateo and Bill Williams are fairly close on the surface numbers. Bill Williams posted stronger numbers in ERA (5.06 vs 5.32) and WHIP (1.313 vs 1.642). Juan Mateo had the advantage in home runs allowed (1.18 per nine innings vs 1.69). By the career numbers, Bill Williams 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.