Four Sins just held Queen's Best in a thrilling finish to the Irish National Stud Blandford Stakes.
The two fillies, who could not be separated in the betting as the 9-4 joint-favourites, were neck and neck throughout the final furlong.
But it was Four Sins, always in the front rank, who prevailed by a short head for jockey Mick Kinane and trainer John Oxx.
Jamie Spencer had to settle for second on Sir Michael Stoute's Newmarket challenger, with Dalvina third.
Oxx said: ‘She did it well. She's been working well recently and I thought today would be her best day.
‘She has been in top form and thriving lately, but she did need a bit of luck on the line.
‘She's done well, winning a Group Three and a Group Two and finishing fourth in the Oaks, so we will have to wait and see what we do next. She's better on this fast ground, although she does go on soft.’
