Anthony Joshua aiming for Wladimir Klitschko fight in 2016

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Anthony Joshua does not expect Gary Cornish to extend him beyond three rounds as he aims to fight Wladimir Klitschko next year.

The 2012 Olympic gold medallist faces his toughest test yet when he meets 6ft 8in unbeaten Scotsman Cornish (21-0, 12 KOs) for the vacant Commonwealth heavyweight title at the O2 Arena in London on Saturday.

But Joshua (13, 13 KOs), 25, still thinks it will be a quick night's work, with victory setting up a British title fight with fellow Londoner Dillian Whyte. All 13 of Joshua's opponents have crumbled inside three rounds and he does not think Cornish will be any different.

"I don't think this will be my longest fight," Joshua told ESPN.

"No one has come at me with much aggression yet against me. Then again I think he'll be a bit smarter than that. He'll come with a bit more character and try to win in style rather than just pure aggression.

"If I can't get past these type of opponents then I've no chance of doing well in boxing. So I can't give him too much credit. I've got to look at him as a threat that I need to get out of there ASAP.

"I know everyone says you need rounds, they will naturally come. I'll never try to go in there and drag out a fight, especially in a professional ring.

"If I can get Cornish out of there in the first minute, I'd love that to happen. That's what people want to see. We're both big guys, heavy-handed, big guys are clumsy and make mistakes. If everything goes to plan it shouldn't be my longest fight.

"I need to get rid of him in order to keep on knocking on the door of world titles. If I was to try to say when it will be, I think a world title fight will be next year. I don't think he has been in with anyone who brings what I bring.

"I go in with a calm attitude and as soon as I see a sign of weakness I can't help myself but to go in and exploit it. I take my time and then they will show an opening and that's when the killer instinct kicks in."

Joshua's goal is to get to Ukrainian Klitschko, 39, before the WBC, WBA and WBO world champion retires. World heavyweight No.1 Klitschko faces Joshua's fellow Briton Tyson Fury on October 24 and Joshua reckons he will be ready for Klitschko with 15 months.

"Hopefully I'll be 14-0 by the end of this year so I think 20-0 would be good, or 18-0, by the time I fight Klitschko," Joshua said.

"Klitschko said he has five more fights in him and I don't know if that includes the Tyson Fury fight next month. A lot of the guys he can fight are mainly up and coming fighters so hopefully that will open the door to the guys like myself.

"If I can get past Cornish, then move on to Dillian Whyte in December, then next year if I can keep on winning then I think for sure he will still be around and me and Klitschko can get it on."