J. A. Happ vs. Joe Kostal — Career Comparison

J. A. Happ built a career as a starting pitcher and Joe Kostal as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Joe Kostal posted stronger surface numbers — ERA 0 and WHIP 2.000 compared to 4.13 and 1.323 for J. A. Happ. By the career numbers, Joe Kostal had the better of this cross-role comparison — though era context would sharpen the verdict.