Adam Peterson vs. Andy Sonnanstine — Career Comparison

Andy Sonnanstine built a career as a starting pitcher and Adam Peterson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Andy Sonnanstine posted stronger surface numbers — ERA 5.26 and WHIP 1.414 compared to 16.88 and 3.750 for Adam Peterson. By the career numbers, Andy Sonnanstine had the better of this cross-role comparison — though era context would sharpen the verdict.