John Gosden's Kingman ran out an easy winner of the Tattersalls Irish 2000 Guineas under James Doyle at the Curragh.
Runner-up behind Night Of Thunder in the QIPCO 2000 Guineas at Newmarket, Kingman went one better in Ireland with a dominant display.
The Invincible Spirit colt cruised up on the outside of long-time leader Shifting Power inside the final furlong and powered clear in the heavy ground for a five-length success.
Shifting Power stuck on for second with Mustajeeb third.
Gosden said: "The track's in pristine condition and he handled it very well. Two (furlongs) out, you could see he was cruising.
"He's a very talented horse and it's lovely to win a Guineas with him.
"This mile takes some getting in these conditions and he (Doyle) rode him beautifully.
"He's a miler and it's good fun because of Richard Hannon (trainer of Night Of Thunder), who I'm very fond of. We've got some rivalry now as the score is 1-1 and he'll go for the St James's Palace (Royal Ascot) now."
Sky Bet offer even money about Kingman for that race, with Night Of Thunder a 5/2 chance to confirm the Newmarket form.
Teddy Grimthorpe, raicng manager for Kingman's owner Khalid Abdullah, added: "He travelled really well in the race and did it pretty comfortably.
"You want good horses to have a bit of spirit. Prince Khalid said we have to make this horse a Classic winner. This is a hugely important race for us.
"I would think we would be still thinking about the QEII (Ascot) at the end of the year, but we've a few little obstacles to get past then."
Gosden had walked the course before giving Kingman the all-clear. Asked how close he had come to taking the son of Invincible Spirit out, Gosden said: "I was quite close, I walked the whole track and it was very debatable. The groundsman has done a fantastic job.
"If they'd had a big handicap over that ground first I probably wouldn't have run, they stayed just off the rail where they had raced in the sprint. It's good track management and important when trying to run a Classic.
"He's won on good to firm, good to soft and now soft to heavy, so he's covered all dimensions.
"Drawn number one in a normal race you'd be concerned about getting boxed in, so when they came across it left him with a clear run and able to relax and come when he wanted.
"I was talking to Frankie (Dettori) and James this morning and I told him to sit chilly and wait and wait."