Casey Janssen vs. Rolla Mapel — Career Comparison

Rolla Mapel built a career as a starting pitcher and Casey Janssen as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Casey Janssen posted stronger surface numbers — ERA 3.63 and WHIP 1.238 compared to 4.5 and 1.700 for Rolla Mapel. By the career numbers, Casey Janssen had the better of this cross-role comparison — though era context would sharpen the verdict.