Dan Jennings vs. John Sullivan — Career Comparison

John Sullivan built a career as a starting pitcher and Dan Jennings as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Dan Jennings posted stronger surface numbers — ERA 3.1 and WHIP 1.486 compared to 4.2 and 2.133 for John Sullivan. By the career numbers, Dan Jennings had the better of this cross-role comparison — though era context would sharpen the verdict.