Joshua bids to win back the three heavyweight crowns that he lost to Ruiz earlier this year, in one of the biggest shock results in recent boxing history.
Despite sending Ruiz to the deck early on, the Mexican-American bounced back to twice knock down Joshua, with the referee calling an end to the fight after he got back to his feet the second time.
This weekend’s rematch takes place in Saudi Arabia – a decision which has drawn critics – and the action will be shown live on Sky Sports Box Office.
A cost of £24.99 has been put on the fight, as pay-per-view prices rise from their normal £19.99.
The fight can still be live streamed on official channels, should you purchase the fight for the fee. If you purchase online, you can watch through the website by logging on.
Boxing fans, however, are once again warned that they should not watch the action on illegal streams, as they could be damaging to your computers.
It is not unusual for websites to ask for small payments to watch the fights, through the likes of PayPal, but there is no guarantee of a decent stream, while they also risk being taken off-air for copyright infringement.
Unofficial streaming sites also leave a worry of creating malware and other computer virus problems, should adequate anti-virus protection not be in place.
Two years ago, Yusuf Mohammed of Bristol was fined £16,000 after showcasing Sky Sports pay-per-view event on a live stream on his social media channels.
Last year, Scarborough-based Craig Foster was slapped with a whopping £85,000 fine after the coverage he bought of the Anthony Joshua vs Wladimir Klitschko fight was shared on Facebook.
He claimed that a friend streamed the footage onto his Facebook page, with the broadcast being seen by around 4,250 people.
But Foster was the man who was charged by the court as he was the man who paid for the Sky Sports Box Office coverage.
Sky used a watermark that was shown on screen to track down Mr Foster.
“I’d paid for the boxing, it wasn’t like I was making any money,” Foster told the Mirror exclusively at the time.
“My iPad was signed in to my Facebook account and my friend just started streaming the fight.
“I didn’t think anything of it, then a few days later they cut my subscription.
“They’re demanding the names and addresses of all my mates who were round that night but I’m not going to give them up. I said I’d take the rap.”