George Groves insists he will become world champion when he makes his third bid for world honours against Badou Jack on September 12.
Groves, beaten twice by Carl Froch in his previous world title attempts, faces Swedish-born Jack for the WBC Super Middleweight title on the undercard of Floyd Mayweather's final fight against Andre Berto in Las Vegas.
Despite being halted twice previously, Groves is confident it will be third time lucky and has move quickly to dispel any talk of problems with his stamina should the fight go 12 rounds.
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Groves (21-2 KO:16) told Sky Sports: "You're never going to be as fresh in the first round as you are in the last. But at the same time, I always finish strong. I've been 12 rounds before in high-intensity fights, fights which I've won, in which I haven't faltered.
"Anyone who wants to base a game plan around me, around stamina, hoping that I'm going to fade and get tired... I'd never do that for any fight, because one day that guy ain't going to get tired, and I certainly ain't going to get tired.
"I'm going full steam ahead, from the first second to the last, and I'm really looking forward to it."
Jack (19-1-1 KO:12) will be making his first defence of the title which he won via a majority decision victory over Anthony Dirrell in April, but Groves is confident it will be his arm raised come fight night despite the negative perception of him in some parts of the media.
He said: "Winning over the hearts and minds of fight fans is a difficult task, you're only as good as your last interview these days. I'm not too fussed about the general perception. As long as we're winning, which we are, we're going to go out and perform and become world champion."