Michael Petersen vs. Andy Sonnanstine — Career Comparison

Andy Sonnanstine built a career as a starting pitcher and Michael Petersen as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Michael Petersen posted stronger surface numbers — ERA 5.02 and WHIP 1.593 compared to 5.26 and 1.414 for Andy Sonnanstine. By the career numbers, Michael Petersen had the better of this cross-role comparison — though era context would sharpen the verdict.