The most important unification in the welterweight division since Terence Crawford-Errol Spence Jr. is just days away. IBF champion Jaron “Boots” Ennis (33-0, 29 KOs) will face WBA champion Eimantas Stanionis (15-0, 9 KOs) not only for each other’s titles but also for the vacant Ring Magazine crown, which is held by the division’s best.