Ubaldo Heredia vs. Robert Ray — Career Comparison

On the career pitching numbers, Robert Ray posted a stronger line than Ubaldo Heredia. Robert Ray posted stronger numbers in ERA (4.18 vs 5.4) and home runs allowed (1.29 per nine innings vs 1.8). By the career numbers, Robert Ray 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.