Robbie Erlin vs. Bob Purkey — Career Comparison

On the career pitching numbers, Bob Purkey posted a stronger line than Robbie Erlin. Bob Purkey posted stronger numbers in ERA (3.79 vs 4.87) and home runs allowed (0.83 per nine innings vs 1.13). By the career numbers, Bob Purkey 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.