Darold Knowles vs. Eduardo Valdés Pérez — Career Comparison

Eduardo Valdés Pérez built a career as a starting pitcher and Darold Knowles as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Darold Knowles posted stronger surface numbers — ERA 3.12 and WHIP 1.439 compared to 10.8 and 2.040 for Eduardo Valdés Pérez. By the career numbers, Darold Knowles had the better of this cross-role comparison — though era context would sharpen the verdict.