Bob O'Brien vs. Sammy Peralta — Career Comparison

Bob O'Brien built a career as a starting pitcher and Sammy Peralta 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 5.12 and 1.774 for Sammy Peralta. By the career numbers, Bob O'Brien had the better of this cross-role comparison — though era context would sharpen the verdict.