Jack Leiter vs. Mark Petkovsek — Career Comparison

Jack Leiter built a career as a starting pitcher and Mark Petkovsek as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mark Petkovsek posted stronger surface numbers — ERA 4.74 and WHIP 1.472 compared to 4.8 and 1.361 for Jack Leiter. By the career numbers, Mark Petkovsek had the better of this cross-role comparison — though era context would sharpen the verdict.