Toormore took his unblemished record to three with an emphatic all-the-way win in the Goffs Vincent O'Brien National Stakes at the Curragh.
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Richard Hughes bounced the Richard Hannon-trained colt out of the stalls and set the pace he wanted.
The even-money favourite asserted a furlong to win from his main market rival Sudirman, with Giovanni Boldini third.
The form of Toormore's victory in the Vintage Stakes at Glorious Goodwood had been given a boost by the success of runner-up Outstrip in the Champagne Stakes at Doncaster on Saturday.
The son of Arakan looked totally in control of his four rivals that included a Group One winner in Sudirman, whom he shrugged aside to score by two and three-quarter lengths and give owners Middleham Park Racing a taste of Group One success.
Tim Palin, racing manager for Middleham Park, said "We weren't sure whether to make the running or not beforehand but he ended up getting a fairly uncontested lead.
"He's a great attitude and the further he goes the better he is.
"He's in the Racing Post Trophy (Doncaster, October 26) but will not run again this season.
"He's a very clean-winded horse, and could go straight for the Guineas next year."
Hughes told At The Races: "The track is wide open and windy, and it's difficult for two-year-olds. It's a lonely old place when the weather's like this.
"He's not a precocious two-year-old by any means and is a big shell of a horse. In fact he's as far away from being precocious as you could be.
"I just felt he'd thickened out a little bit since Goodwood and he was very impressive.
"I didn't want to get stuck behind horses as as you saw at Goodwood he nearly got caught out there, but he lengthened out well today and did it nice.
"Group One races are hard to win. If you win one impressively, you've got to be pretty good."