Certify streaked away to a four-and-a-half-length victory from Roz, with Amazonas third, after making the break for the front.
Mickael Barzalona managed to keep cool, sitting near the back, before making his destructive move with two furlongs remaining.
"She was excited before the race which is not normal. She's run four times now and that's enough for her this season," Barzalona said.
Chigun managed to hold off favourite Thistle Bird to win a dramatic Mawatheeq Rosemary Stakes.
Penitent held off a late charge from Side Glance to win the Nayef Joel Stakes by a neck.
Meanwhile, Waterway Run pipped Light up My Life to victory in the Sakhee Oh So Sharp Stakes.