Frank Hafner vs. Mark Prior — Career Comparison

Mark Prior built a career as a starting pitcher and Frank Hafner as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Mark Prior posted stronger surface numbers — ERA 3.51 and WHIP 1.240 compared to 7 and 2.222 for Frank Hafner. By the career numbers, Mark Prior had the better of this cross-role comparison — though era context would sharpen the verdict.