Star mare Imperatriz is set to run in the Newmarket Handicap at Flemington.
Te Akau Racing announced its decision on Imperatriz's next run after the mare had worked at Moonee Valley on Friday morning.
The Group 1 Newmarket Handicap (1200m) will be run on Saturday week.
Te Akau, headed by David Ellis, trainer Mark Walker, assistant-trainer Ben Gleeson and Karyn Fenton-Ellis had also been considering the Group 1 Canterbury Stakes (1300m) at Randwick on March 9.
"Te Akau Racing can confirm our star mare Imperatriz will contest the Group 1 Newmarket Handicap on 9 March at Flemington," Te Akau Racing posted on X, formerly Twitter.
"Careful consideration was given to both Sydney and Melbourne options for that date and a number of factors (pros & cons) determined the decision by the team of David, Mark, Karyn and Ben.
"With her main end targets remaining the William Reid at Moonee Valley and the TJ Smith at Randwick, we believe this is in the mare's best interests.
"She enjoyed her track gallop this morning, her work was excellent."
Imperatriz has strung together six wins on the trot in Melbourne since Artorius lowered her colours in the Canterbury Stakes last year.
She is expected to receive 58kg, the same weight Black Caviar carried in her 2011 Newmarket win.
Imperatriz resumed with a hard-fought victory in the Group 1 Lightning Stakes (1000m) at Flemington on February 17.
Nominations for the Newmarket Handicap close on Monday.