Brian O'Connor vs. Les Willis — Career Comparison

On the career pitching numbers, Les Willis posted a stronger line than Brian O'Connor. Les Willis posted stronger numbers in ERA (3.48 vs 5.11) and home runs allowed (0.61 per nine innings vs 1.46). By the career numbers, Les Willis 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.