Jack Leiter vs. Bill Mack — Career Comparison

Jack Leiter built a career as a starting pitcher and Bill Mack as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Bill Mack posted stronger surface numbers — ERA 3 and WHIP 1.000 compared to 4.8 and 1.361 for Jack Leiter. By the career numbers, Bill Mack had the better of this cross-role comparison — though era context would sharpen the verdict.