Luis Rivera vs. Mike Willis — Career Comparison

Looking at the career totals, Luis Rivera and Mike Willis are fairly close on the surface numbers. Luis Rivera posted stronger numbers in ERA (1.23 vs 4.59) and home runs allowed (0 per nine innings vs 1.09). Mike Willis had the advantage in WHIP (1.524 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.