Saturday's fight will be broadcast live on Showtime in the United States, beginning at 5 p.m. ET.
"There has always been talk about what is happening next but Parker is my focus", said Joshua, who at 17st 4lbs is nearly a stone lighter than when he met Wladimir Klitschko 11 months ago. "I want him to say my name and we will make the fight happen once and for all". "I'm focused and I understand it's a boxing match and the people are expecting the pinnacle of boxing".
In Parker, Joshua will have a toughened challenger, an undaunted underdog with skills, size, and experience, who has yet to taste defeat.
For this fight, Joshua said he planned on coming in lighter on his feet so he could adjust to Parker's strengths as a boxer. "There's not much of a weight difference, which is good".
"The biggest thing for me is the challenge of fighting someone like Joshua, and the challenge of if it goes into a dark place, how long will I stay there for?" We're both going to move well and throw some big bombs. He had good moments but not enough and couldn't hurt Joshua when it mattered.
"The incredible global TV sales for Saturday night's event prove that Anthony Joshua is main man in the game", said Hearn.
Joshua wants Wilder to fight him - but in the UK.
The seventh was another close round, with both men hitting on the break, referee Giuseppe Quartarone issuing another warning.
"I saw confidence", Parker said. "We've done everything we can in training to prepare".
That's all there is to it, enjoy the big Joshua vs Parker fight! But what I mean is Parker will have to just go for it, pushing himself that little bit more. I'm in good shape.
A victory would pave the way for Joshua to face undefeated American Deontay Wilder as he bids to become the undisputed world heavyweight champion.
"I'm 20-0, I'm unified champ, muscle or not, I'm still handling business", Joshua said.
It is one of the most evocative titles in sport: the world heavyweight boxing champion. That's what I'm going for and that's what my mindset is.
"I'm young, hungry, fit and strong", he said. You want him to win because he feels like the good guy. Joshua landed 39% of his power shots and 6 jabs per round, while opponents landed just 25.3% of their power punches (3.8 per round more than half the heavyweight average). Previous winners of unifications include Muhammad Ali, Joe Frazier, Mike Tyson, Evander Holyfield, Lennox Lewis and Wladimir Klitschko. I've got another voluntary to do and that's at any time.
With good looks, Herculean muscles and a flawless 20 knockouts in 20 professional bouts, Joshua has quickly become one of the sport's biggest global stars.