Mike Foltynewicz vs. Ron Keller — Career Comparison

Mike Foltynewicz built a career as a starting pitcher and Ron Keller as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Ron Keller posted stronger surface numbers — ERA 3.38 and WHIP 1.453 compared to 4.52 and 1.327 for Mike Foltynewicz. By the career numbers, Ron Keller had the better of this cross-role comparison — though era context would sharpen the verdict.