Marvada put in a brave performance to successfully concede 10lb to her younger rivals in the Group Three Irish Stallion Farms EBF Brownstown Stakes at Naas.
Ken Condon's four-year-old had never previously raced on heavy ground but coped well with the conditions and opened her account at Pattern level with a three-quarter-length defeat of Caprella.
The disappointment of the race was the Aidan O'Brien-trained After, who threatened to make an impact passing the furlong marker but didn't find as much as expected.
There were another couple of upsets for O'Brien, starting with 1-4 favourite Parliament Sqaure, who weakened to finish third behind Jim Bolger's Grafelli (12-1) in the opening Irish Stallion Farms EBF Maiden.
Parliament Square had finished a close fifth in the Windsor Castle at Royal Ascot, but he floundered in the testing conditions as Grafelli showed a willing attitude under Kevin Manning to see off Three Sea Captains by half a length.
O'Brien had another strongly fancied runner turned over as 33-1 outsider Viztoria won the Irish Stallion Farms EBF Fillies Maiden on debut.
Where was the market leader but her supporters knew their fate as the winner quickened impressively passing the two-furlong pole.
Adrian McGuiness' Oratorio filly simply had to be kept up to her work by Ian Brennan to draw seven and a half lengths clear of Mrs Bean.
Pat Martin's Stones Peak (7-1) took the Final tote.com BBQ Evening At Naas 25th July Handicap under Ronan Whelan.
Drawn in stall one, 5lb claimer Whelan kept his mount towards the centre of the track as others grouped nearer the stands rail, and the decision payed off handsomely.
Whelan immediately doubled up on the in-form Custom Cut, who completed a hat-trick in the Site Serve Supporting Enable Ireland Handicap.
George Kent's inmate was always to the fore and went on to beat Captain Cullen.
