Charlie Kerfeld vs. John Shaffer — Career Comparison

Looking at the career totals, Charlie Kerfeld and John Shaffer are fairly close on the surface numbers. John Shaffer posted stronger numbers in WHIP (1.492 vs 1.572) and home runs allowed (0.15 per nine innings vs 0.54). Charlie Kerfeld had the advantage in ERA (4.2 vs 4.57). By the career numbers, John Shaffer 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.