Rafael Montalvo vs. Willis Roberts — Career Comparison

Looking at the career totals, Rafael Montalvo and Willis Roberts are fairly close on the surface numbers. Willis Roberts posted stronger numbers in ERA (4.64 vs 9) and WHIP (1.521 vs 3.000). Rafael Montalvo had the advantage in home runs allowed (0 per nine innings vs 0.94). By the career numbers, Willis Roberts 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.