John Duffie vs. Greg Mullins — Career Comparison

John Duffie built a career as a starting pitcher and Greg Mullins as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Greg Mullins posted stronger surface numbers — ERA 0 and WHIP 1.000 compared to 2.79 and 1.655 for John Duffie. By the career numbers, Greg Mullins had the better of this cross-role comparison — though era context would sharpen the verdict.