Jack Leiter vs. Jonathan Papelbon — Career Comparison

Jack Leiter built a career as a starting pitcher and Jonathan Papelbon as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Jonathan Papelbon posted stronger surface numbers — ERA 2.44 and WHIP 1.068 compared to 4.8 and 1.361 for Jack Leiter. By the career numbers, Jonathan Papelbon had the better of this cross-role comparison — though era context would sharpen the verdict.