Casey Fien vs. Mark Prior — Career Comparison

Mark Prior built a career as a starting pitcher and Casey Fien as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mark Prior led in strikeout rate (K%+ 170 vs 100), skill-based run prevention (DICE+ 137 vs 105), and home run suppression (HR9+ 112 vs 88). Casey Fien held the edge in walk avoidance (BB%+ 193 vs 110). Role difference aside, Mark Prior holds a clear edge on every meaningful shared measure.