Anthony Joshua will make a stunning return to the ring on Saturday night, but a heavyweight rival has sent a vicious warning ahead of the Brit's meeting with Kristian Prenga10:36, 21 Jul 2026Kristian Prenga has been backed to repeat what Andy Ruiz did and shock the world by beating Anthony Joshua on Saturday night.‌That is according to Prenga's sparring partner, Brandon Moore - who envisions a stunning upset in Saudi Arabia. Joshua and Prenga will meet in a heavyweight showdown this weekend, and providing 'AJ' comes away unscathed - he will then take on long-time rival Tyson Fury later this year.‌Joshua, 36, was last seen in the ring back in December when he knocked out Jake Paul in a rather uninspiring Miami melee. Just days on from his win over the YouTuber-turned-boxer, 'AJ' was involved in a tragic car crash which claimed the lives of close friends Latif Ayodele and Sina Ghami.‌Many wondered whether the Brit would fight again, but it was not long before he got the itch to return to the squared-circle. While several are expecting an easy night at the office for the Brit this weekend, Moore believes that might not necessarily be the case.FOLLOW OUR FIGHTING FB PAGE! Latest boxing and MMA news, analysis and much more via our dedicated Facebook pageProfessional heavyweight brawler Moore can see a major shock, similar to the Ruiz fight. Joshua's first defeat came against Ruiz back in 2019 in a huge upset in New York that saw him lose his world titles. But just a few months later, 'AJ' would go on to get his revenge.‌"[Prenga] looks really, really, really good in sparring right now. It's going to be a pretty entertaining fight," Moore told Sky Sports. "I think that he has a pretty good shot of beating him, and I think he's bigger than Joshua. Joshua just has a muscular physique, but Prenga's a bigger man."It's going to be a tough fight, but I think he can catch [Joshua] the same way Andy Ruiz did. This is AJ's first fight back. AJ's had a lot of stuff going on in his life - nothing but respect to AJ, but when you're getting back into the ring, you haven't fought in a while, that ring rust is real. This is not a small thing - everybody's going to be watching."He added: "I told [Prenga] that he has the opportunity of a lifetime. He has the opportunity that I would wish for. AJ is a great fighter, and he's done amazing things in the sport of boxing.‌"But [Prenga] has the opportunity, you know, to be in the names of people that have beaten future Hall of Famers. Everything has to be aligned. He has to do everything perfectly."Joshua, though, is hoping to avoid a seismic upset and book himself a date with Fury before the end of the year. "I know exactly what I need to do. I’m not worried about respecting this particular opponent, but when I look at myself, I know I’m going to deliver," he said ahead of the fight."This is my division. On July 25 in Jeddah, the best man will win. I’m going to go in there and show how good I am. I’m going to show him my class, my skill and my boxing IQ and see if he can survive my power as well."Article continues below