Trainer Kevin Barry: "We've been taking little steps over the last three years but I've got to say, this was not a littlestep. This was a real guy. I tried to prepare everybody and tell you that Joe was going to have to dig deeper than he ever had before - he dug deeper than he ever has before.
Promoter Dean Lonergan: "I'm not elated, I'm just relieved. Joseph has made a statement tonight that he's one of the best heavyweights in the world."
British heavyweight contender Dillian Whyte, 28, was not impressed with Parker's performance.
Whyte, stopped by Joshua in seven rounds in December, told the Sun: "He did alright, but I'd love to fight him. I can see so many holes in his game.
"It was all about the win, but I don't think Takam is better than me right now. He's on his last legs, as he showed against Parker.
"He never had that drive and desire to win the rounds. If he'd found an extra gear, he could have beaten Parker.