Roberto Duran vs. Rolla Mapel — Career Comparison

Rolla Mapel built a career as a starting pitcher and Roberto Duran as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Rolla Mapel posted stronger surface numbers — ERA 4.5 and WHIP 1.700 compared to 6.58 and 1.846 for Roberto Duran. By the career numbers, Rolla Mapel had the better of this cross-role comparison — though era context would sharpen the verdict.