Trevor Kelley vs. Brian O'Connor — Career Comparison

Looking at the career totals, Trevor Kelley and Brian O'Connor are fairly close on the surface numbers. Brian O'Connor posted stronger numbers in ERA (5.11 vs 6.75) and home runs allowed (1.46 per nine innings vs 2.66). Trevor Kelley had the advantage in WHIP (1.579 vs 1.865). By the career numbers, Brian O'Connor 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.