Jack Aker vs. Unknown Lester — Career Comparison

Unknown Lester built a career as a starting pitcher and Jack Aker as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Unknown Lester posted stronger surface numbers — ERA 2.57 and WHIP 1.000 compared to 3.28 and 1.369 for Jack Aker. By the career numbers, Unknown Lester had the better of this cross-role comparison — though era context would sharpen the verdict.