Justin Masterson vs. Zac Rosscup — Career Comparison

Justin Masterson built a career as a starting pitcher and Zac Rosscup as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Justin Masterson posted stronger surface numbers — ERA 4.31 and WHIP 1.412 compared to 5.09 and 1.673 for Zac Rosscup. By the career numbers, Justin Masterson had the better of this cross-role comparison — though era context would sharpen the verdict.