Zach McClellan vs. George O'Donnell — Career Comparison

George O'Donnell built a career as a starting pitcher and Zach McClellan 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 5.79 and 1.929 for Zach McClellan. By the career numbers, George O'Donnell had the better of this cross-role comparison — though era context would sharpen the verdict.