She finished with a flourish in the mile-and-a-quarter Nassau Stakes for fillies and mares to capture Group 1 honours by a length and a quarter from long-time leader Mehdaayih, ridden by Frankie Dettori. The victory was the second time Japan have won a G1 contest in Britain following Agnes World's win in the 2000 G1 July Cup at Newmarket.
Despite Deirdre finishing down the field in the Prince Of Wales's Stakes at Royal Ascot in June, connections blamed the soft ground for her performance and decided to remain in England for a tilt at the Goodwood alternative.
The mare is owned by Mr Toji Morita, who owns a family business in Osaka, Japan. His Racing Manager Seiko Hashida Yoshimura, who is also the daughter of the winning trainer Mitsuru Hashida, was thrilled by Deirdre's success.