Troy Percival vs. Mason Thompson — Career Comparison

Looking at the career totals, Troy Percival and Mason Thompson are fairly close on the surface numbers. Troy Percival posted stronger numbers in ERA (3.17 vs 5.21) and WHIP (1.143 vs 1.667). Mason Thompson had the advantage in home runs allowed (0.87 per nine innings vs 1.08). By the career numbers, Troy Percival 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.