Bob Pepper vs. Mariano Rivera — Career Comparison

Looking at the career totals, Bob Pepper and Mariano Rivera are fairly close on the surface numbers. Bob Pepper posted stronger numbers in ERA (1.8 vs 2.21) and home runs allowed (0 per nine innings vs 0.5). Mariano Rivera had the advantage in WHIP (1.032 vs 2.000). By the career numbers, Bob Pepper 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.