John Costello vs. Kodai Senga — Career Comparison

Kodai Senga built a career as a starting pitcher and John Costello as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Kodai Senga led in strikeout rate (K%+ 120 vs 99), home run suppression (HR9+ 135 vs 115), and skill-based run prevention (DICE+ 113 vs 99). John Costello held the edge in walk avoidance (BB%+ 91 vs 70). Role difference aside, Kodai Senga holds a clear edge on every meaningful shared measure.