Andy Ruiz Jnr and Anthony Joshua are all set to meet in a rematch of their June thriller on Saturday night and fireworks are expected to fly when the two cross swords again in the “Clash on the Dunes” for the Mexican’s WBA (Super), IBF, WBO, and IBO heavyweight titles. Mexican Ruiz stunned the world earlier this year when he defied massive odds to upset the previously unbeaten Olympic gold medallist Joshua. The 30-year-old stepped in at just six weeks’ notice to fight the unbeaten Briton after his original opponent, Jarrell Miller, was unable to fight, and in the process become his country’s first ever heavyweight champion. Ruiz said the win changed his life and was the fulfilment of a lifelong ambition. On Saturday night (Sunday morning, Hong Kong time), he gets the opportunity to prove the first win was no fluke – as some in the sport have unkindly suggested – and potentially send Joshua into early retirement. Have the two fought before? They have indeed. Ruiz (33-1) handed Joshua the first loss of his professional career at Madison Square Garden in New York City back in June with a stunning seventh round TKO after knocking the champion down four times. Incredibly, Ruiz had also dragged himself off the canvas before the devastating finish. The Mexican, who fought two of his formative bouts in Macau, stepped in as a last-minute replacement just a few weeks before the fight and was an overwhelming outsider going in to the fight. For Joshua, the loss prompted a stampede of revisionism from many in the sport, who began to pick holes in his ability. Joshua against two of the division biggest stars – Tyson Fury and Deontay Wilder – was the contest on everyone’s lips ahead of his US debut against Ruiz. But after the disastrous loss, Joshua has been largely discounted by his fellow pros. Luckily for the Briton, his savvy handler Eddie Hearn had the foresight to include an immediate rematch clause in the fight contract allowing him to make amends. He has a big point to prove this weekend. Where is the fight being held? The venue of the do-over was much discussed before a deal was sealed and the eventual decision to field the fight in Saudi Arabia invited much derision from those who questioned the human rights records of the host. The West Asian kingdom is still pushing its soft power play into global sport and the money on offer has been difficult for major bodies to turn down in recent years. Prize fighting is an obvious match. The Diryah Arena on the outskirts of the capital city Riyadh, is a spectacular 15,000-seater venue which was built in less than two months following the confirmation of the deal to stage the bout. According to saudigazette.com.sa, the arena consists of 300 tonnes of steel, covers 10,000 sq m at the centre of a historic Unesco heritage site (the birthplace of the first kings of Saudi Arabia) and took 175 dedicated construction workers to finish the venue in time. What do the bookmakers say? Just like first time around, the bookmakers are favouring the Briton, but not with anything like as much certainty. Current betting on Joshua is around $1.45. You can still get up to $3 if you fancy Ruiz, and $26 for the draw. The most likely outcome for the bookies is a Joshua win via TKO – you can get $2.1 on that. In terms of round betting, Joshua after 12 rounds (on points) is favoured at $5. How much will they get for the fight? As usual with these fight contracts, they’re pretty well-guarded secrets. But, also as usual, insider leaks provide fodder for the tabloids. Several UK newspapers report that Joshua will net an eye-watering US$85 million for the tilt, while Ruiz will scoop a “measly” US$13 million. It’s reported to be the fourth highest purse in boxing history. Rather more soberly, and arguably more reliably, Forbes estimates Joshua will make “upwards of US$60 million”, while Ruiz’s take is US$9 million, just two million more than he earned for stunning the world in one of boxing’s great upsets first time around. How are the experts calling it? WBC heavyweight champion Deontay Wilder will be observing the action in Saudi Arabia closely, but he thinks Ruiz wins again second time around, even more easily. Legendary trainer Floyd Mayweather Snr said he believed that if Joshua can make the necessary adjustments, he gets the edge. Amir Khan’s trainer Virgil Hunter likes Ruiz again calling the 29-year-old “the prefect heavyweight”. What time does it start? As is often the case with pay-per-view extravaganzas, you can expect the fight to be running late, especially if some fights on the undercard go the distance. But best estimates suggest an 11.45pm (local time) ring walk. That is 8.45pm GMT and 4.45am on Sunday for us in Hong Kong.