Grant Jackson vs. Luis Rivera — Career Comparison

Looking at the career totals, Grant Jackson and Luis Rivera are fairly close on the surface numbers. Luis Rivera posted stronger numbers in ERA (1.23 vs 3.46) and home runs allowed (0 per nine innings vs 0.72). Grant Jackson had the advantage in WHIP (1.365 vs 1.636). By the career numbers, Luis Rivera 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.