John Purdin vs. Leo Rosales — Career Comparison

Looking at the career totals, John Purdin and Leo Rosales are fairly close on the surface numbers. John Purdin posted stronger numbers in ERA (3.9 vs 5.01) and WHIP (1.410 vs 1.505). Leo Rosales had the advantage in home runs allowed (0.88 per nine innings vs 1.46). By the career numbers, John Purdin 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.