David Aardsma vs. Willie Jefferson — Career Comparison

Willie Jefferson built a career as a starting pitcher and David Aardsma as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Willie Jefferson posted stronger surface numbers — ERA 3.94 and WHIP 1.314 compared to 4.27 and 1.487 for David Aardsma. By the career numbers, Willie Jefferson had the better of this cross-role comparison — though era context would sharpen the verdict.