Rubick has shown enough from one race start to earn favouritism for the country's major two-year-old races.

But it is his relaxed nature away from the track trainer Gerald Ryan believes is his biggest asset and the one that separates him from the pack.

The colt is odds-on to cement his favouritism for the $1 million Blue Diamond Stakes when he runs in Saturday's Prelude at Caulfield.

Far from frightening the opposition away, Rubick will have a capacity field of 15 rivals gunning for him.

Earthquake, who runs in the Fillies Prelude, was relegated to second favourite for the Group One race on February 22 after Rubick's debut win at Randwick.

The Darley filly had a jump-out at Flemington on Tuesday to test her skills in the anti-clockwise direction while Rubick has been given plenty of practice at his Rosehill home.

"He is a really relaxed individual," Ryan said.

"He handled the trip to Melbourne with no problems. He's eating his feed and doing what we ask. He's just a laid-back horse that is mature beyond what you normally expect from two-year-olds."

The meeting has been brought forward to an 11am start avoid the hottest part of the day which is expected to be between 5pm and 6pm.

Predictions for the two-year-old races in the early afternoon from 34 degrees upwards.

"I don't really know how he will handle the heat they are predicting but with the races earlier we should miss the worst of it," Ryan said.

"I don't think much worries him but tomorrow will tell.

"We will just try to keep him cool and relaxed."

Rubick, who jumps from barrier two, is the TAB's $1.60 favourite for the Prelude with Chivalry next at $11 and Nostradamus at $13.

Trainer Mick Price has weight of numbers on his side with four runners with three he thinks can get into the Blue Diamond field.

"This is a really, really hot colts division," Price said.

"And what evens it up apart from Rubick, is Chivalry has drawn 15 and Nostradamus has drawn worse.

"So those two are going to have to have a lot of luck and my three colts (Berlutti, Cornrow and Jabali) are all going great."

Price said his chances rested with those three because he thought perhaps Geromayo had had enough after an unsuccessful Magic Millions campaign.

Glen Boss, who rides Nostradamus for the Hawkes team, admitted he would have his work cut out from the outside gate and would discuss tactics with the trainers.

"It's going to be very difficult," he said. "Especially with a couple of the ones drawn low like Rubick.

"He's the one we've all got to beat."