An exceptional piece of horsemanship has put Darley filly Cameo on course for a serious autumn carnival target after her win in the Keith Nolan Classic at Kembla Grange on Sunday.

Craig Williams has ridden successfully on the world stage but trainer Peter Snowden doubted the jockey had ever produced a ride as good as the one that helped deliver Cameo her first stakes win.

"Gee, that was a brilliant ride," Snowden said.

"Anyone would have thought he had barrier one."

Australian Oaks-bound Cameo in fact had the exact opposite draw, starting from the outside stall in a field of 16.

But within 200 metres, Williams had Cameo parked on the rail, conserving energy behind the leader and ultimately she didn't have to go around another horse to win the Group Three feature.

"I wasn't happy when the barrier came out but the plan was to go forward," Snowden said.

"You've still got to have the horse to do it and I didn't expect her to be on the fence."

Williams was riding at the Sydney provincial track for the first time in a career that has taken him all around the globe to partner some of the world's elite horses.

It was a veteran jockey who was once known as the 'king of Kembla' who helped Williams execute a memorable ride.

"I actually came down in the car with Rodney Quinn and he told me all about the filly because he had ridden her two starts back," Williams said.

"He told me she was a little bit cranky in the yard last time but today she was right on song and happy to be here."

Cameo joins subsequent Group One winners Hot Danish, Coco Cobanna, Allez Wonder and Saturday's Coolmore Classic winner Appearance on the Classic honour roll and Snowden thinks this year's edition will also hold up as a form reference.

"That was a good field today," he said.

"In the spring she showed good ability but I just tested the water with her to see what level she could have got to.

"I thought she could have made the (VRC) Oaks in the spring but she was just that little bit immature and I'm glad I pulled up with her."

Cameo ($17) held off Royal Descent ($6) to win by a half head with Gold Epona ($17) another 1-3/4 lengths away third.

She will head towards the Group One Australian Oaks via another Group One race, the $400,000 Vinery Stakes at Rosehill on April 6.