A long-range plan to target autumn riches with Chateau Lafaite is a step closer after the filly's barnstorming win at Randwick on Saturday.

A sister to Australian Oaks winner Royal Descent, Chateau Lafaite was sent out the $3.30 favourite in the Great Gatsby Handicap (1400m), a benchmark race for three-year-olds, and came from second last on the turn to beat Gamblestown ($6.50) by a short head.

Like Royal Descent, Chateau Lafaite is raced by her breeder Gerry Harvey and trained by Chris Waller.

"The three-year-old fields in Sydney are pretty strong and she's also beaten the colts which is a big call," Waller said.

It was the second win from three starts for Chateau Lafaite who won a Canterbury two-year-old race in June and ran second to Earnest Desire at the same track last month.

Waller will consider a stakes race in Melbourne over the coming weeks over a similar distance to Saturday.

"Because she is a filly, I'd like to get some black type if we could," he said.

"If there was the right race in Melbourne in three weeks time over 1400 metres I'd take her down for a bit of experience."

But Waller's main focus is on next year.

"When you've won an Oaks you like to defend the title," he said.

"She's a full-sister to Royal Descent so it's a logical dream.

"She's very similar to Royal Descent - maybe a little bit stronger.

"We will look at all the fillies races in the autumn after she has had a good, long spell."

Royal Descent has been solidly supported in Caulfield Cup markets in recent weeks and is second favourite behind her stablemate Hawkspur.