The rider arguably closest to More Joyous is adamant the outstanding mare has an edge over Pierro despite her younger stablemate attracting most pre-post support for the Canterbury Stakes.

Her trackwork partner Steve O'Halloran says More Joyous' record as a proven weight-for-age racehorse makes her an obvious pick in the $300,000 Group One sprint at Rosehill on Saturday.

"I think the mare can win ... she's been there and done it before and she's going as well as she has ever been," O'Halloran told trainer Gai Waterhouse in a video posted on the trainer's website.

More Joyous is resuming in a race she has won for the past two years and O'Halloran insists the mare is ready for a clash that promises to take centre stage during the Coolmore Classic meeting.

"I think this week she just knows it is raceday on Saturday," he said.

"She just has that extra spring in her step.

"She knows that she is almost one hundred per cent fit ... she knows what is going on."

More Joyous is a multiple weight-for-age winner while Pierro has raced just once at the elite scale when he beat her home in his third placing in last year's Cox Plate.

But Pierro is carrying the weight of most early money, holding down favouritism at $2.50 while More Joyous has eased to $2.80.

"If you take out the twenty thousand dollars we took on Pierro yesterday, there is still four times the amount of money on him than More Joyous," TAB spokesman Glenn Munsie said.

"It's quite surprising considering how the race is going to be run.

"More Joyous is going to be in front of Pierro you would have to think."

Munsie said there had even been more interest in the third favourite, the Victorian sprinter Moment Of Change, than More Joyous.

Moment Of Change has firmed from $6 to $4.60 to be the only other runner under double figures.