Jose Diaz vs. Roman Mendez — Career Comparison

On the career pitching numbers, Roman Mendez posted a stronger line than Jose Diaz. Roman Mendez posted stronger numbers in ERA (3.09 vs 9.39) and WHIP (1.329 vs 2.609). By the career numbers, Roman Mendez 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.