Tom Koehler vs. Brian O'Connor — Career Comparison

Tom Koehler built a career as a starting pitcher and Brian O'Connor as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Tom Koehler posted stronger surface numbers — ERA 4.39 and WHIP 1.414 compared to 5.11 and 1.865 for Brian O'Connor. By the career numbers, Tom Koehler had the better of this cross-role comparison — though era context would sharpen the verdict.