John Duffie vs. Shang Johnson — Career Comparison

Looking at the career totals, John Duffie and Shang Johnson are fairly close on the surface numbers. Shang Johnson posted stronger numbers in WHIP (1.347 vs 1.655) and home runs allowed (0.2 per nine innings vs 0.93). John Duffie had the advantage in ERA (2.79 vs 4.18). By the career numbers, Shang Johnson 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.