Jai Opetaia had a brutal first-round knockout of Ellis Zorro during his bout in Saudi Arabia. Forced to vacate his IBF world title belt to take part in the mega-card in Riyadh early on Sunday morning (AEDT), the Australian delivered four seconds remaining in the first round. The former Olympian moved to 24-0 with 19 stoppages and retained his Ring Magazine belt, describing the one-punch knockout as devastating and scary. Zorro smiled sheepishly, marking his first loss in 18 professional fights. Promoter Eddie Hearn said the Australian had the potential to unify the cruiserweight division before moving up to the heavyweights. The Saudi card features heavyweight stars Anthony Joshua, Deontay Wilder, Joseph Parker, and light heavyweight champion Dimitri Bivol.