Casey Janssen vs. Mike Warren — Career Comparison

Mike Warren 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 5.06 and 1.510 for Mike Warren. By the career numbers, Casey Janssen had the better of this cross-role comparison — though era context would sharpen the verdict.