Alex Kellner vs. John Mackinson — Career Comparison

Alex Kellner built a career as a starting pitcher and John Mackinson as a reliever — different jobs with different demands — but on the metrics that apply to both, a comparison is still worth making. Alex Kellner posted stronger surface numbers — ERA 4.41 and WHIP 1.451 compared to 7.36 and 1.773 for John Mackinson. By the career numbers, Alex Kellner had the better of this cross-role comparison — though era context would sharpen the verdict.