Mark Mercer vs. Rich Thompson — Career Comparison

Looking at the career totals, Mark Mercer and Rich Thompson are fairly close on the surface numbers. Rich Thompson posted stronger numbers in ERA (4.21 vs 4.7) and WHIP (1.357 vs 1.826). Mark Mercer had the advantage in home runs allowed (1.17 per nine innings vs 1.55). By the career numbers, Rich Thompson 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.