Since shedding her maiden tag at the County Kilkenny circuit in July, the daughter of Australia had finished fourth in the Hurry Harriet Stakes at Gowran and third in the Snow Fairy Stakes at the Curragh.
Sent off a 9-2 chance for this nine-and-a-half-furlong contest, Epona Plays travelled kindly into the home straight and got the better of a final furlong battle with Etneya by a neck.
Market leader Ennistymon (2-1) – runner-up in the Ribblesdale at Royal Ascot and the Oaks at Epsom earlier in the season – was disappointing in first-time blinkers.
McCreery said: “I thought she was a decent filly last year and she ran a cracking race in Leopardstown.
“It’s taken her a while to get going, but she loves it here. She’s progressing well and they went a proper gallop.
“Billy said she was just behind the bit lovely all the way and when he asked her, she was always going to respond. He said she did it snugly in the end.
“I’m delighted for the owner/breeders Renzo Forni and his daughter Raffaello. That’s the fourth of that family that have won for me and the three fillies have all got black type.
“She had a little niggle earlier in the year that we have sorted out and she’s coming on the whole time. She’s a lovely, scopey filly and goes on any ground.”
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