Jack Armstrong vs. Roberto Duran — Career Comparison

Jack Armstrong 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. Jack Armstrong posted stronger surface numbers — ERA 4.58 and WHIP 1.458 compared to 6.58 and 1.846 for Roberto Duran. By the career numbers, Jack Armstrong had the better of this cross-role comparison — though era context would sharpen the verdict.