Frank Hafner vs. Garrett Olson — Career Comparison

Garrett Olson 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. Garrett Olson posted stronger surface numbers — ERA 6.26 and WHIP 1.679 compared to 7 and 2.222 for Frank Hafner. By the career numbers, Garrett Olson had the better of this cross-role comparison — though era context would sharpen the verdict.