Sea Oscar and connections© Photo Healy Racing
Sea Oscar made the best way home over the 1m7f handicap which rounded out Leopardstown's fixture.
The five-year-old mare tracked Art Of Silence who led at a sedate pace before passing him with nine furlongs still to negotiate.
Dylan Browne McMonagle began to increase the pace on the new leader and attempted to kick entering the home straight. Extensio looked a threat, but Sea Oscar went away from him inside the final furlong and forged on to cross the line three lengths to the good at 5/1.
Extensio took the runner-up berth at 6/1 and was a length and a-half in front of Oranmore (33/1).
Joseph O'Brien said: “She's a well-bred filly, she's a (half) sister to Greenland, and she's in foal to Saxon Warrior. She wasn't a winner and she's a winner now.
“She has plenty of talent and the cheekpieces and a step up in trip helped her.”
When asked if she would run again he added: “We'll leave it up to the owners to decide, but being a winner is very much a big box ticked for her for her future.”
Additional reporting by Gary Carson