Equipped with blinkers, the 11-1 shot pulled away in the final furlong to beat Chachamaidee by a length and a half, with First City third.
“We put the blinkers on to help her concentrate as she’s quite idle,” said trainer Tommy Stack’s son and assistant, Fozzy. “We’ll give her a break and train her for the Matron Stakes. That’s her main autumn target.’’
There was a sting in the tail for jockey Wayne Lordan as he was banned for four days (June 29 to July 2 inclusive) for using his whip in an incorrect position.
Meanwhile Richard Hannon could finally believe what he saw in a gallop at Kempton last week was true after Strong Suit bounced back to form in emphatic fashion in the Jersey Stakes.
The three-year-old had surprised the champion trainer when finishing upsides Canford Cliffs, the brilliant winner of Tuesday’s Queen Anne Stakes.
But Hannon could not tell for sure if a breathing operation the colt had after he disappointed behind Frankel in the Greenham Stakes had worked.
Strong Suit (11-1) saw out the race in great style as he defeated Codemaster by half a length with Western Aristocrat staying on for third in a strongly run race.
“We took him to Newbury racecourse two days after that race as we couldn’t believe how badly he had run,” said Hannon. “We put a camera on him and it showed that his throat was closing so he wasn’t getting enough air and it also affected his confidence.
“It was a straightforward operation and when we worked him at Kempton the other day I couldn’t believe it.’’
Former top jockey Walter Swinburn saddled his first Royal Ascot winner when Julienas (12-1) held the heavily-backed 7-1 favourite Dance And Dance by half a length in the hands of Eddie Ahern and then had to survive a stewards’ inquiry.
“I had so many winners here as a jockey. I won the Gold Cup with Indian Queen and Zilzal won here of course, but to train a winner is something else,” said Swinburn.
Richard Hughes and Hannon combined for a 155-1 double when Best Terms ran out a thrilling winner of the Queen Mary Stakes.
Meanwhile Tom Dascombe and Richard Kingscote are Royal Ascot virgins no more after the victory of Rhythm Of Light (8-1) in the Sandringham Handicap.