Champion Perth trainer says a blowout result from one of his three gallopers can't be ruled out in Saturday's Listed Placid Ark Stakes at Ascot.

Champion jockey James McDonald is confident he can crown a record-breaking spring carnival by netting another Group 1 win on promising filly Aeliana at Caulfield on Saturday.

The Japanese galloper Obamburumai took the spoils of the $10m Golden Eagle last year, but hasn't been able to prevail in a race since.