1-5 favourite Camelot maintained his unbeaten record in the Dubai Duty Free Irish Derby at the Curragh - but was given a scare by Born To Sea.
Aidan O'Brien was winning the Classic for a remarkable seventh successive season and his latest star colt was always cantering under the trainer's son Joseph.
However when he was let down over a furlong out he jinked left and Johnny Murtagh attacked aboard the eventual runner-up.
For a stride or two he looked a genuine threat but Camelot soon had his measure and went on to win with authority by two lengths.
The winning trainer said: "We really felt it wasn't the right thing (to run on this ground) but he's a great horse.
"He's a real fast ground horse. We appreciate all the hard work everyone's put in, the sponsors, The Curragh - I can't say how thrilled we are to be part of it. It doesn't get any better than this. These are days you can't dream of.
"I never would have believed it could ever happen. He's by far the best we've had - we've never had anything like this.
"He had the speed to win the Guineas, the class to win the Derby and then he had to have class, courage and stamina to win today. Obviously the lads will speak about the Triple Crown now, wouldn't it be something to dream about?"
O'Brien jnr said: "He wasn't handling the ground at all. He has a big heart and tries very hard. He's got himself out of a hole because he hated that ground.
"I travelled very well, nice and relaxed, I never had a worry throughout the race, only he was hating the ground!
"I knew underneath me that he wasn't liking it and it's testament to the horse he is that he's won today.
"I think he's a very, very good horse. He showed today how big a heart he has, that he can pull himself through that ground and still win big races quite easy."
Co-owner John Magnier said: "He hated the ground - we were lucky to get away with it.
"We'll have to talk to Michael (Tabor) and Derrick (Smith) about the Triple Crown but they're older than me so they'll want to go there!"