Juan Alvarez vs. Matt Duff — Career Comparison

Looking at the career totals, Juan Alvarez and Matt Duff are fairly close on the surface numbers. Matt Duff posted stronger numbers in ERA (4.76 vs 5.22) and home runs allowed (0 per nine innings vs 1.79). Juan Alvarez had the advantage in WHIP (1.657 vs 2.294). By the career numbers, Matt Duff 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.