Errol Spence Jr. volunteered to take over from Jermall Charlo on Tim Tszyu's July 25 welterweight card in Australia after Charlo's entry denial . Spence took aim at Charlo's public trash talk, stating the opponent ' shoots off at the mouth'. The visa denial killed the scheduled bout just days before fight night. Spence's offer keeps the card scrambling on short notice as promoters work to salvage the event. The sudden turn has fans weighing in about what comes next for the Sydney-stage fight . Spence's history of high-pressure finishes makes his pitch hard to ignore, even on tight notice . Charlo's team has yet to respond publicly , leaving the picture unclear around his next move. For now, the focus stays on how fast a new deal gets done as the promotion races the clock .