Rocky Coppinger vs. Mike Perez — Career Comparison

Rocky Coppinger built a career as a starting pitcher and Mike Perez as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mike Perez posted stronger surface numbers — ERA 3.56 and WHIP 1.376 compared to 5.47 and 1.626 for Rocky Coppinger. By the career numbers, Mike Perez had the better of this cross-role comparison — though era context would sharpen the verdict.