Izzi Top turned in a deeply impressive performance to win the Barclays Bank Ireland Pretty Polly Stakes at the Curragh.
The British raider was 6-4 to secure her third victory from as many starts this season and tracked the 10-11 favourite Sapphire into the home straight.
It was soon evident she had the market leader's measure and once William Buick pushed the button, the John Gosden-trained Izzi Top comfortably went to the lead, scoring by a length and a quarter.
Izzi Top was third in last year's Epsom Oaks - her only previous start at the highest level - and came into this race unbeaten in three subsequent outings, most recently when so accomplished in the Middleton Stakes at York.
Gosden had voiced concerns earlier in the week about the rain-softened conditions in Ireland, but his filly handled the testing ground with aplomb to continue the yard's excellent campaign.
The Dermot Weld-trained Sapphire had not previously been tested in Group One company, but looked ready for the step up in class when annihilating her rivals on her seasonal reappearance at Cork.
She enjoyed the run of the race out in front under Pat Smullen, but simply had no answer when the winner quickened to the lead.
David Simcock's I'm A Dreamer finished third, with Up completing a four-runner field which was decimated following the earlier defections of Was, Maybe and Bible Belt.
Famous Name ticked off yet another Group Three prize - his 10th at that level and 17th in all - as he landed the Friarstown Stud International Stakes for the third time.
Dermot Weld's veteran (4-7 favourite) was settled in second by Pat Smullen and eased past Defining Year approaching the final furlong before readily going clear to score by three and three-quarter lengths.
Improving three-year-old Hartani gave every indication he is a stayer with a bright future as he completed a hat-trick in the At The Races Curragh Cup.
Johnny Murtagh hit the front at the quarter-mile pole on the John Oxx-trained 5-2 chance and dismissed prolific winner Midnight Soprano as he pulled five and a half lengths clear in the Group Three contest.
Andy Oliver's filly Sendmylovetorose (9-2) missed the Albany at Royal Ascot after stalls trouble, but put that behind her as she kept on strongly for Colm O'Donoghue to account for favourite True Verdict by a length and a quarter in the Grangecon Stud Stakes (Group Three).
The Camelot colours were carried to victory in the Barronstown Stud EBF (C & G) Maiden when Aidan O'Brien's newcomer The United States (2-1), ridden by Joseph O'Brien, got the better of rallying leader Dibayani by a head.
Edward Harty's veteran chaser Captain Cee Bee (6-1) put up an oustanding show in the Foleys Antiques EBF Handicap, tracking favourite Sky Pilot into the closing stages under Fran Berry and surging past to win by seven lengths.