Mark Mercer vs. Jeff Richardson — Career Comparison

Looking at the career totals, Mark Mercer and Jeff Richardson are fairly close on the surface numbers. Jeff Richardson posted stronger numbers in ERA (0 vs 4.7) and home runs allowed (0 per nine innings vs 1.17). Mark Mercer had the advantage in WHIP (1.826 vs 3.000). By the career numbers, Jeff Richardson 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.