Sea Of Grace battled back in the dying strides to take Group Three honours in the Flame Of Tara EBF Stakes at the Curragh.
After moving eyecatchingly from last place to lead over a furlong out, the 7-2 chance was headed by old rival Eziyra but John Oxx's filly knuckled down admirably for Declan McDonogh.
The daughter of Born To Sea got her head back in front where it mattered to deny the Dermot Weld-trained even-money favourite by a neck.
Oxx said: "It was fast enough for her as she would like a bit of an ease. They went a good gallop and she has a good turn of foot.
"Declan gave her a squeeze and off she went. Then I thought she would get beaten, but she is very courageous and has plenty of heart.
"She has gone the right way, and was better today than when she beat Eziyra (at Tipperary). They are two good fillies."
He added: "If there is an ease in the ground, we may let her take her chance in the Moyglare. It's only two weeks away but we'll see how she is.
"It was the plan to drop her in, and she is becoming more settled. Declan said she is still quite green, so hopefully she will continue to improve.
"He dam wasn't that great but did win over a mile and a half."
Both Sea Of Grace and Eziyra are now at 25-1 for the Investec Oaks.
Meanwhile, Yucatan wore down his Aidan O'Brien-trained stablemate Taj Mahal to open his account in the Ladbrokes EBF (C&G) Maiden at the Curragh.
Taj Mahal set out to make all the running and had Lightening Fast, a son of Frankel, for company for most of the mile journey.
When he could not go on, Donnacha O'Brien brought the impeccably-bred 4-1 winner - by Galileo out of Six Perfections - with a telling run that saw him get up close home to score by a head.
Three Jacks was two and a three-quarter lengths away third.
O'Brien said: "He came forward lovely from the first day and had a lovely run the first day under Ana (O'Brien).
"He's a very well-bred horse and he looks a middle-distance horse for next year. I'm trying to educate him this year and, if he comes out of this race OK, he could have another run.
"He added: "The other horse (Taj Mahal) is a bit frustrating and is still very babyish. He's looking in front of him all the time. He's not ungenuine, but just babyish."
O'Brien junior said: "He's still a little green and pricked his ears. The gap came lovely and it worked out well.
"He might be a mile-and-a-quarter horse next year."
To Choose (10-1) repeated last year's victory in the Derek O'Sullivan Memorial Apprentice Handicap with a hard-fought success.
In Our Blood made a valiant attempt to make all but was collared in the last 100 yards by Tom Gibney's seven-year-old, who got the verdict by length in the hands of Sean Davis.
Gibney said: "I don't know what happened at Roscommon the last day. Seamie (Heffernan) said he just didn't feel right.
"Everything was nearly identical to last year in terms of weights, and Sean gave him a lovely ride. He did exactly as he was told.
"He'll continue to mix it between the Flat and hurdles."
Somehow drew away from the opposition in the final furlong to comfortably land the spoils in the Snow Fairy Stakes.
Seamie Heffernan brought Somehow (5-2) with a sweeping run on the outside to grab the lead and quickly bound clear.
Duchess Andorra and Planchart set the pace and there were plenty in with chances before the Aidan O'Brien-trained Somehow sealed victory in a few strides.
There were seven lengths back to Mick Channon's Epsom Icon in second place, with Godolphin's Skiffle staying on for third spot, half a length away.
O'Brien said: "She is an improving filly, and Fastnet Rock's seem to get better as they get older.
"Seamie said not to be afraid of going back with her for the Matron Stakes. She's getting quicker."
And Intelligence Cross looked in a different class to his rivals as he powered away to convincingly take the Round Tower Stakes.
Placed in his last two starts behind Mehmas after opening his account over this course and distance, Aidan O'Brien's youngster was always well-placed on the near-side rail as Velveteen made the running.
When Seamie Heffernan asked the 11-8 favourite for his effort the response was impressive as he quickened clear to score by four and a quarter lengths from Holy Cat. De Boss Man was a neck back in third.
Intelligence Cross was completing a treble for O'Brien following the wins of Yucatan and Somehow earlier on the card.
O'Brien said: "He went to York, but didn't run because of the ground. He missed a few bits of work because of going over there and I was a little bit worried about that today.
"We'll look at the Middle Park now with him."