David Hernandez vs. Bob O'Brien — Career Comparison

Bob O'Brien built a career as a starting pitcher and David Hernandez as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Bob O'Brien posted stronger surface numbers — ERA 3 and WHIP 1.333 compared to 4.12 and 1.335 for David Hernandez. By the career numbers, Bob O'Brien had the better of this cross-role comparison — though era context would sharpen the verdict.