John Mulligan vs. John O'Connell — Career Comparison

On the career numbers, John Mulligan posted the stronger offensive profile against John O'Connell. John Mulligan posted stronger numbers in OPS (.500 vs .459) and slugging (.250 vs .196). John O'Connell had the advantage in on-base percentage (.263 vs .250). By the career numbers, John Mulligan had the stronger overall case — though those totals don't account for the eras and run environments each player worked in.