Ryan Moore and The Grey Gatsby collared Australia in the final strides of the Qipco Irish Champion Stakes at Leopardstown.
There had been two lengths between the pair when dual Derby hero Australia had been the impressive winner of the Juddmonte International at York.
It looked as if Aidan O'Brien's 30-100 favourite was bound for another Group One victory when striking the front inside the final furlong, but Moore had been stoking the Kevin Ryan-trained winner (7-1) along at the rear and swooped on Joseph O'Brien's outside to lead at the post.
The Grey Gatsby was a Classic winner himself, having collected the French Derby under an inspired Moore back in June.
He was one of those in no hurry during the early stages, as Australia's pacemaker Kingfisher and the Hamdan Al Maktoum pair Alkasser and Mukhadram formed a leading pack.
O'Brien was forced to go quite wide around the home bend, while Moore saved ground on the inner and used that momentum to take him on to yet another major success.
