Current IBF heavyweight champion Charles Martin is confident that his title fight with the unbeaten Anthony Joshua will not last 12 rounds, and he will retain the belt at the O2 Arena in London on Saturday.
Joshua is looking to continue his perfect record of 15 fights, 15 wins and 15 knockouts, against the American, who has knocked out his opponent in 21 of his 23 victories, and draw once. But Martin believes he will blemish the Londoner's record.
"It's not going the distance," Martin told Sky Sports.
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"It only takes 10lbs of pressure to knock a man out and he's an elite athlete so it might take a couple of more pounds but I know I'm hitting with at least 900lbs of pressure.
"I can whack, I'm not just a pure puncher, like all I can do is punch, I've got more stuff to me, but I can definitely knock people out, I can definitely whack.
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"I just wait for the opportunity and when I see it, I'll whack him, I'll sting him and stay on my game."
Martin is expecting to enter the ring to a chorus of boos on Saturday, with 18,000 fans set watch the most eagerly anticipated fight of the year, so far. And he was booed by 1000 fans during an open training session in London, earlier in the week.
But the 29-year-old is determined to see off Joshua, in his first title defence of his career - having turned professional at the late age of 23 - while the Englishman is looking for his first world title, which promoter Eddie Hearn has tipped to change the future of British boxing, should the 26-year-old claim the world title.
"I'm here to stay, it ain't a game, I came this far and I'm going to keep it going. I came too far, my whole life has been changed." Martin added.
"I've turned my whole life around, anyone can turn their life around if you're heading down the wrong path or you're not happy with where you are in life, only you can make the change."
Hearn has also hinted that, should Joshua beat Martin, there could be a bout with loud-mouth Tyson Fury later in the year.
Fury has recently questioned the up and coming Londoner's ability and that will serve as an extra incentive for the 26-year-old to ensure he knocks out Martin on Saturday.
But, first of all, Joshua must see off Martin in what is expected to be the 6ft 6in heavyweight's toughest test in professional boxing to date. Victory will also see him join James DeGale as the only other British boxer to win gold at the Olympics and a world title.