Willie Collazo vs. Mitch Keller — Career Comparison

Mitch Keller built a career as a starting pitcher and Willie Collazo as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mitch Keller posted stronger surface numbers — ERA 4.51 and WHIP 1.384 compared to 6.35 and 2.294 for Willie Collazo. By the career numbers, Mitch Keller had the better of this cross-role comparison — though era context would sharpen the verdict.