George O'Donnell vs. Masahiro Tanaka — Career Comparison

Looking at the career totals, George O'Donnell and Masahiro Tanaka are fairly close on the surface numbers. Masahiro Tanaka posted stronger numbers in ERA (3.74 vs 4.53) and WHIP (1.131 vs 1.443). George O'Donnell had the advantage in home runs allowed (0.41 per nine innings vs 1.36). By the career numbers, Masahiro Tanaka 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.