Brazos ran out clear-cut winner of the Irish Cesarewitch for trainer John Murphy and jockey Shane Foley at Navan.
The four-year-old foiled Willie Mullins' seven-strong team as he looked to follow up his victory with Low Sun in the Newmarket equivalent on Saturday.
Sandymount Duke set the early pace in the two-mile affair, while there was drama when Like An Open Book came down, taking out the Aidan O'Brien-trained Cliffs Of Doneen before the race hotted up.
Brazos swept into the lead over a furlong out and went to land the spoils by a length and a quarter from Davids Charm.
Mr Everest was a length away in third, with Nessun Dorma the first home of the Mullins party in fourth.
Foley said: "I've always liked him from when he won his maiden. He beat Exchange Rate in Killarney and I couldn't believe how much a difference there was in their prices today.
"He relished the trip and the ground, and he worked like a good horse the other morning. He wears the blinkers, but they're only on as he's just bone idle. I'd a lovely trip around and he's won well."
All The King's Men produced a gallant performance from the front to take Listed honours in the Irish Stallion Farms EBF Legacy Stakes.
Seamie Heffernan, who was another to enjoy a big day at Newmarket on Saturday, grabbed the rail on O'Brien's son of No Nay Never, who found plenty when the challengers looked to be queuing up.
In the end the 8-1 chance looked to be going away again in beating Recon Mission by a length and three-quarters.
The winner's stablemate Never Mo More was sent off the even-money favourite, but finished out of the places.
Medicine Jack emerged victorious for Ger Lyons and Colin Keane in an eventful running of the Waterford Testimonial Stakes.
The O'Brien-trained Lost Treasure was sent off the 2-1 favourite on the back of his tremendous run to be fifth in last weekend's Prix de l'Abbaye, and looked to have done enough when hitting the front late in the day.
"He wants it a bit softer, but it was lovely and safe there. He loved being in the bunch and getting a bit of cover"
However, Medicine Jack rallied with the post looming, and got the Listed verdict by a short head, with Smash Williams another head back in third.
Shane Lyons, assistant to his brother, said: "Delighted to get that, and his last run told us he was back to his old self.
"He wants it a bit softer, but it was lovely and safe there. He loved being in the bunch and getting a bit of cover. He never picked the stick up and he ran with great enthusiasm.
"That will give him a bit of confidence and set him up for next year."
Peach Tree returned to her best to give O'Brien a Listed-raced double on the day in the Staffordstown Stud Stakes.
The daughter of Galileo had run well in the face of some stiff tasks this season, with the exception of last time out in the May Hill Stakes at Doncaster, where she was disappointing.
Bouncing back from that, Donnacha O'Brien's mount kept on well as the 5-2 favourite when hitting the front, getting the better of the running-on Tarnawa by a length and three-quarters.
