Dazzling (5-1) was an all-the-way winner of the Irish Stallion Farms E.B.F. Salsabil Stakes at Navan.
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Winner of a maiden from her three starts last season, the Aidan O'Brien-trained daughter of Galileo found plenty for pressure to beat Cristal Fashion by a length and three-quarters, with the winner's stablemate Terrific just a nose further back in third.
O'Brien said: "I'm delighted. She's a lovely staying filly and she'll get further. She looks an Oaks filly and she'll have a run between now and then somewhere.
"She should get a mile and a half I would imagine. That was her first run and she should come on from it. I was delighted with the third filly (Terrific) also."
Palace made it a double for the O'Brien team with a taking performance in the 20 Family Ticket For May 18th Family Day Fillies Maiden, coming forward markedly from her debut fourth at Leopardstown at the beginning of this month.
The 4-6 favourite led over a furlong out and stayed on to keep Gorteo at bay by four and three-quarter lengths.
O'Brien, who also bred the winner, said: "She's a nice filly and I'm delighted with her. We'll have to see whether she runs again now before the Irish Guineas. She's coming forward lovely. She's very smart and we always thought she was.
"The Fastnet Rocks want really good ground. It's Australian breeding and they want fast ground. They have big engines. She was our best filly last year but she met with a setback and didn't get to run."