In a remarkable video posted by MaxBoxing on Friday, former unified heavyweight champion Anthony Joshua went into-depth for the first time since his shocking defeat at the hands of Andy Ruiz Jr, on where he thinks it went wrong and why he lost.

In the build-up to the fight in 'The World's Most Famous Arena,' Madison Square Garden, New York City, Joshua was certainly the favourite to win.

At the time, Joshua was the WBA, WBO and IBF heavyweight champion of the world, and was undefeated in his professional career. He looked unstoppable, and if anyone was going to stop him, it didn't look like it was going to be Ruiz. 

Ruiz was a late stand-in after Jarrell Miller failed drug tests, and while he had proven to be refreshing, due to his atypical build, sometimes referred to as 'hero of the Dad Bod community,' he was not taken as seriously as it was later clear AJ needed to.

Both 29-years-old, Ruiz was the more experienced of the two in professional boxing, fighting 144 rounds compared to Joshua's 84, with the Mexican-American on a 32-1-0 win-loss-draw record, while AJ sat at a squeaky clean 22-0-0. 

Joshua reveals in the interview with MaxBoxing, that going into the bout, "my purpose for that fight was 'am I fighting [Deontay] Wilder next?' The purpose for that fight was 'what is he doing next?' It wasn't solely upon winning that fight." 

It looks like the Brit was severely overlooking Ruiz before the encounter, which potentially is one of the main reasons for his loss. 

When the fight began, the first round was relatively normal. Joshua comments that in the first 30-seconds of the fight, he was thinking "he can't keep up with me, with my feet." AJ agrees that the first round was 'business as usual' as the two fighters felt each other out. 

In the second round, Joshua recalls that he "heard the crowd booing," apparently this was because there was a fight going on in the crowd, but according to AJ, he thought the booing was for him and this put him off greatly.

In the third round, Joshua scored a knockdown, but was then floored twice by Ruiz before the end of the round, and then put down again twice more in the seventh before the fight was called off, with AJ on all fours after spitting his gum shield out. 

In the post-fight news conference, Joshua was asked about the potential fights with WBC heavyweight champion Deontay Wilder and Tyson Fury, which he had spoken about so much before the battle with Ruiz. He responded by saying: "I still want to compete with those men but a rematch with Andy Ruiz Jr is where we are at. I'm still a champ and I will rectify it to get the belts back."

Continuing with MaxBoxing, Joshua said: "I'd rather have gone out on my back than the referee calling off, but he has a job to do and we respect that.

"I'm knocking on everyone's door and I'm coming. I've done it once I can do it again, I've won, I've unified the division twice, become heavyweight champion, I've been put on my back, I've lost. I'm an experienced fighter, so there's a lot more I can give."

Joshua is currently scheduled to fight Ruiz Jr in a rematch in Saudi Arabia on December 7, though there is currently a dispute ongoing with Ruiz's pay for the bout, so only time will tell how it will fold out.