Jim Peterson vs. Lefty Williams — Career Comparison

Lefty Williams built a career as a starting pitcher and Jim Peterson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Lefty Williams posted stronger surface numbers — ERA 3.13 and WHIP 1.238 compared to 5.27 and 1.665 for Jim Peterson. By the career numbers, Lefty Williams had the better of this cross-role comparison — though era context would sharpen the verdict.