Andrew Chafin vs. John Costello — Career Comparison

The numbers give Andrew Chafin a clear advantage over John Costello across the core pitching metrics. Andrew Chafin led in home run suppression (HR9+ 146 vs 115), skill-based run prevention (DICE+ 116 vs 99), and strikeout rate (K%+ 111 vs 99). John Costello held the edge in run prevention (ERA+ 135 vs 117). Andrew Chafin was the better reliever — the numbers make that case clearly.