R. J. Alvarez vs. Art Mahaffey — Career Comparison

Art Mahaffey built a career as a starting pitcher and R. J. Alvarez as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Art Mahaffey posted stronger surface numbers — ERA 4.17 and WHIP 1.351 compared to 7.71 and 1.879 for R. J. Alvarez. By the career numbers, Art Mahaffey had the better of this cross-role comparison — though era context would sharpen the verdict.