George O'Donnell vs. Merkin Valdez — Career Comparison

George O'Donnell built a career as a starting pitcher and Merkin Valdez as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. George O'Donnell posted stronger surface numbers — ERA 4.53 and WHIP 1.443 compared to 5.57 and 1.789 for Merkin Valdez. By the career numbers, George O'Donnell had the better of this cross-role comparison — though era context would sharpen the verdict.