John Allen vs. Esteban Yan — Career Comparison

Looking at the career totals, John Allen and Esteban Yan are fairly close on the surface numbers. Esteban Yan posted stronger numbers in ERA (5.14 vs 18) and WHIP (1.512 vs 2.000). John Allen had the advantage in home runs allowed (0 per nine innings vs 1.36). By the career numbers, Esteban Yan 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.