David Aardsma vs. John Foley — Career Comparison

Looking at the career totals, David Aardsma and John Foley are fairly close on the surface numbers. John Foley posted stronger numbers in WHIP (1.375 vs 1.487) and home runs allowed (0 per nine innings vs 1.09). David Aardsma had the advantage in ERA (4.27 vs 4.5). By the career numbers, John Foley 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.