Zach Day vs. B. J. Rosenberg — Career Comparison

Zach Day built a career as a starting pitcher and B. J. Rosenberg as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Zach Day posted stronger surface numbers — ERA 4.66 and WHIP 1.554 compared to 5.72 and 1.571 for B. J. Rosenberg. By the career numbers, Zach Day had the better of this cross-role comparison — though era context would sharpen the verdict.