According to Wladimir Klitschko, he's never seen Anthony Joshua look so big and muscular, as the heavyweight chapion weighed in at a career high 250-pounds for their IBF, IBO, WBA world titles showdown in front of 90,000 spectators at London's Wembley Stadium.

"I've never seen AJ (Joshua) as big as he is right now. He is as big as Arnold Schwarzenegger at his best," said Klitschko. "He's a puncher. I'm a boxer that can punch."

But Joshua refused to rise to the bait and on Friday he would not be drawn when asked about how he would win.

"It depends if I see an opportunity," the 27-year-old Joshua said about the possibility of a knockout.

"My main focus is to focus round by round, for 12 rounds. I don't hate Klitschko, I just want to beat Klitschko.

"I’ve been switched on since December 10, my last fight. All I have to do is focus on this fight and making it as easy as possible.

"When you are competing it's tunnel vision. Even though there are beautiful people, I have to keep tunnel vision."

Klitschko, who has had 50 more professional fights than Joshua, hopes his superior experience will see him become world heavyweight champion for the third time.

"I just have this feeling -- this is my night," said Klitschko, who turned professional after winning gold at the 1996 Olympics. "It's a big step for AJ. He hasn't fought this type of quality of fighter yet. It's going to be challenging for him -- but challenging for me as well."

Joshua will make a third defence of his International Boxing Federation (IBF) world heavyweight title, with the vacant World Boxing Association (WBA) belt also on the line.

Lennox Lewis believes Joshua will prevail.

"There are still unanswered questions with Joshua, but Joshua (to win) early," said Lewis.

Deontay Wilder, the World Boxing Council (WBC) heavyweight champion, was present at the weigh-in and the American could face the winner of Saturday's bout in the next 12 months.

"A victory for Joshua would be better because people want to see the Joshua fight," Wilder told reporters.

"But I'm proud of both guys, this is exciting, I had to be here.

"It was not as if Fury beat Klitschko up. He didn't take a beat down, he should be fresh. We will see if age plays a big factor."