Casey Janssen vs. Jason Marquis — Career Comparison

Jason Marquis built a career as a starting pitcher and Casey Janssen as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Casey Janssen led in walk avoidance (BB%+ 171 vs 88), skill-based run prevention (DICE+ 94 vs 78), and home run suppression (HR9+ 85 vs 70). Jason Marquis held the edge in strikeout rate (K%+ 79 vs 76). Role difference aside, Casey Janssen holds a clear edge on every meaningful shared measure.