Robbie Erlin vs. John Shaffer — Career Comparison

Robbie Erlin built a career as a starting pitcher and John Shaffer as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. John Shaffer posted stronger surface numbers — ERA 4.57 and WHIP 1.492 compared to 4.87 and 1.297 for Robbie Erlin. By the career numbers, John Shaffer had the better of this cross-role comparison — though era context would sharpen the verdict.