David Aardsma vs. Charlie Kerfeld — Career Comparison

The numbers give Charlie Kerfeld a clear advantage over David Aardsma across the core pitching metrics. Charlie Kerfeld led in home run suppression (HR9+ 170 vs 114), skill-based run prevention (DICE+ 109 vs 99), and run prevention (ERA+ 116 vs 109). David Aardsma held the edge in strikeout rate (K%+ 120 vs 112). Charlie Kerfeld was the better reliever — the numbers make that case clearly.