Keith Butler vs. Diomedes Olivo — Career Comparison

Looking at the career totals, Keith Butler and Diomedes Olivo are fairly close on the surface numbers. Keith Butler posted stronger numbers in WHIP (1.409 vs 1.491) and home runs allowed (0 per nine innings vs 0.59). Diomedes Olivo had the advantage in ERA (3.1 vs 6.14). By the career numbers, Keith Butler 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.