Gai Waterhouse remains adamant the Caulfield Guineas is the priority for Pierro although he has replaced stablemate More Joyous as Cox Plate favourite.

The unbeaten colt stretched his record to seven in Saturday's Run To The Rose at Rosehill and was immediately promoted to the head of TAB's market at $5.50.

He is at $2 for the Caulfield Guineas against his fellow three-year-olds on October 13.

"I won't make up my mind about the Cox Plate until after he runs in the Caulfield Guineas," Waterhouse said.

"The Guineas is the main race. It is the race he is being set for."

The trainer did, however, compare Pierro favourably to horses like So You Think and Red Anchor, both three-year-old winners of Australia's weight-for-age championship.

Waterhouse will give Pierro a good look at Moonee Valley where the Cox Plate is run with the colt to have his next start later this month in the Bill Stutt Stakes rather than the Golden Rose in Sydney.

More Joyous, $6.50 for the Cox Plate on October 27, is set to kick off her campaign in the Sheraco Stakes (1200m) at Rosehill on September 15.

New Zealander Ocean Park's win in Saturday's Makfi Stakes at Hastings has him on target for a Cox Plate start and he is now a $15 chance.

The Makfi (1400m) was his first start since he finished a half neck second to Laser Hawk in the Rosehill Guineas during the Sydney autumn.

Sincero is a $17 chance after his win in Saturday's Group Two Memsie Stakes at Caulfield.

Many of the other leading Cox Plate hopes are scheduled to run at Saturday's feature meeting at Flemington.