John Shaffer vs. Mike Willis — Career Comparison

Looking at the career totals, John Shaffer and Mike Willis are fairly close on the surface numbers. John Shaffer had the edge in home runs allowed (0.15 per nine innings vs 1.09). 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.