Mark Leiter vs. Lefty Thomas — Career Comparison

Looking at the career totals, Mark Leiter and Lefty Thomas are fairly close on the surface numbers. Lefty Thomas posted stronger numbers in ERA (3.32 vs 4.57) and home runs allowed (0 per nine innings vs 1.18). Mark Leiter had the advantage in WHIP (1.412 vs 1.800). By the career numbers, Lefty Thomas 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.