Bill Koski vs. Brian O'Connor — Career Comparison

Looking at the career totals, Bill Koski and Brian O'Connor are fairly close on the surface numbers. Brian O'Connor posted stronger numbers in ERA (5.11 vs 6.67) and WHIP (1.865 vs 2.000). Bill Koski had the advantage in home runs allowed (0.67 per nine innings vs 1.46). 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.