Jack Aker vs. Fernando Arroyo — Career Comparison

Fernando Arroyo built a career as a starting pitcher and Jack Aker as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Fernando Arroyo led in walk avoidance (BB%+ 132 vs 100), home run suppression (HR9+ 91 vs 76), and run prevention (ERA+ 96 vs 89). Jack Aker held the edge in strikeout rate (K%+ 86 vs 58). Role difference aside, Fernando Arroyo holds a clear edge on every meaningful shared measure.