Cousin Vinny became the first horse to supplement success in Cheltenham's Champion Bumper with another win in the Paddy Power Champion INH Flat Race.
Trained by Willie Mullins and ridden again by his son Patrick, the 9-2 joint-favourite was always travelling smoothly and pulled himself into a challenging position on the run to the home bend.
Cousin Vinny took over with just under a quarter-mile to run and came right away from Endless Intrigue to register a most impressive 10-length triumph.
The winning trainer said: 'I'm absolutely delighted with him. He looks to be a proper horse, he's got gears and he stays.
"Apt Approach set a really good gallop but Cousin Vinny went away and that was a hell of a performance.
'I schooled him the other morning and he makes some shape over his hurdles and looks to be something else. I hope he makes up into a top novice hurdler next year and I'd like to think we can go towards the Supreme Novices' Hurdle with him.'
The record of Cheltenham winners coming here was a big worry and he hadn't been firing at home. I worked him four times and his first three pieces were very average.
'We then took him away to work and I told his rider to ask for everything he had and he really fired himself up, so I think he might just have been asleep at home.'
