Pathfork (2-1) made it three wins from as many starts in the boylesports.com Vincent O’Brien National Stakes at the Curragh.
But Jessica Harrington’s two-year-old had to pull out all of the stops to see off Casamento in a thrilling renewal of the Group One contest.
The latter had made most before the strong-moving Pathfork threw down his challenge, and responded in kind as the two fought out a ding-dong battle at the business end.
Zoffany was sent off the 6-4 favourite but was one of the first of the principals to send out distress signals and was a never-dangerous third.
Harrington said: ``Fran said he had to be really tough and that he didn't really like the ground.
“Pure class got him there in the end and it’s just fantastic.
“I felt sick beforehand and my panic during the race was that he was in front for so long.
“I’m going to the sales at Keeneland in the morning and I’ll make plans with the owners then.
“He did have a very hard race there.”