Frank Castillo vs. Joe Grzenda — Career Comparison

Frank Castillo built a career as a starting pitcher and Joe Grzenda as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Joe Grzenda led in home run suppression (HR9+ 188 vs 76), skill-based run prevention (DICE+ 113 vs 92), and run prevention (ERA+ 100 vs 82). Frank Castillo held the edge in strikeout rate (K%+ 97 vs 86). Role difference aside, Joe Grzenda holds a clear edge on every meaningful shared measure.