John Poloni vs. Mariano Rivera — Career Comparison

John Poloni built a career as a starting pitcher and Mariano Rivera as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mariano Rivera posted stronger surface numbers — ERA 2.21 and WHIP 1.032 compared to 6.43 and 1.286 for John Poloni. By the career numbers, Mariano Rivera had the better of this cross-role comparison — though era context would sharpen the verdict.