Errol Spence Jr. volunteered to replace Jermall Charlo on Tim Tszyu's July 25 welterweight card in Australia after Charlo's visa trouble . Spence took aim at Charlo's public trash talk, stating the opponent ' shoots off at the mouth'. The visa denial forced the cancellation of the scheduled bout just days before fight night. Spence's offer puts promoters on the clock on short notice as promoters try to rescue the event. The late twist has fans speculating about what comes next for the down under showdown . Spence's history of high-pressure finishes makes his pitch hard to ignore, even on short weeks. Charlo's team has yet to address the visa fallout , leaving questions unanswered around his next move. For now, the focus stays on whether the date holds as the promotion races the clock .