The all-conquering O'Brien family teamed up for five winners at Naas on Wednesday evening, highlighted by the victory of Oklahoma City.
Trainer Aidan provided his son Joseph with four winners while his daughter, Ana, rode Waver (11-4 joint-favourite) to victory in the Follow Naas On Facebook Apprentice Handicap in the colours of her mother Anne-Marie.
Oklahoma City could make a swift reappearance next week after running out an easy winner of the Irish Stallion Farms EBF (C & G) Maiden, coming home a 13-length winner.
Sent off the 1-2 favourite in a first-time visor, Oklahoma City was building on a satisfactory debut effort when sixth behind subsequent Railway Stakes winner Sudirman at Leopardstown last month.
"The visor must have woken him up and obviously he came forward well from his first run," said the trainer
"We'll probably look to step him up in grade now. We could look for a Listed race or the Group Three Anglesey Stakes at the Curragh (July 20) could be a possibility as well."
Minorette (5-4 favourite) then won the Irish Stallion Farms EBF Maiden on her debut by a length and three-quarters before Rain God (15-8) won the one mile handicap.to defy a 5lb penalty having won at Leopardstown six days ago.
The five-timer was completed by The Vatican (11-4) in the Tipper Road Race who will now step up in class.
Joseph O'Brien said: "That's my first four-timer although I did ride four winners on the same day last year at Dundalk and Killarney."