Jairo Diaz vs. John Halama — Career Comparison

John Halama built a career as a starting pitcher and Jairo Diaz as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. John Halama posted stronger surface numbers — ERA 4.65 and WHIP 1.474 compared to 4.86 and 1.556 for Jairo Diaz. By the career numbers, John Halama had the better of this cross-role comparison — though era context would sharpen the verdict.