Kei Igawa vs. Herbert Jackson — Career Comparison

Looking at the career totals, Kei Igawa and Herbert Jackson are fairly close on the surface numbers. Herbert Jackson posted stronger numbers in ERA (5.73 vs 6.66) and home runs allowed (0.82 per nine innings vs 1.88). Kei Igawa had the advantage in WHIP (1.772 vs 1.909). By the career numbers, Herbert Jackson 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.