Juan Guzman vs. Jack O'Connor — Career Comparison

Juan Guzman built a career as a starting pitcher and Jack O'Connor as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Juan Guzman led in strikeout rate (K%+ 120 vs 85), home run suppression (HR9+ 113 vs 89), and run prevention (ERA+ 102 vs 80). Jack O'Connor held the edge in walk avoidance (BB%+ 82 vs 81). Role difference aside, Juan Guzman holds a clear edge on every meaningful shared measure.