Jack Aker vs. Frank Viola — Career Comparison

Frank Viola 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. Frank Viola led in strikeout rate (K%+ 114 vs 86), walk avoidance (BB%+ 113 vs 100), and skill-based run prevention (DICE+ 95 vs 88). Jack Aker held the edge in home run suppression (HR9+ 76 vs 73). Role difference aside, Frank Viola holds a clear edge on every meaningful shared measure.