Tulloch Lodge's new era has been christened with a stakes win by Golden Rose-bound colt Thronum.

The stable established by Gai Waterhouse's legendary father Tommy Smith now carries the name of her co-trainer Adrian Bott.

Waterhouse and Bott's first runner in a black-type race was also their first winner in partnership with Thronum winning the Listed Rosebud at Randwick on Saturday.

"You sort of have to pinch yourself but I couldn't be happier," Bott said.

"I'm delighted with that win."

The 28-year-old said the partnership with Waterhouse was a long-range plan.

"She's an incredible mentor and she's there for the full support," Bott said.

Thronum is set to give Bott his first Group One runner when he starts in the Golden Rose at Rosehill on September 10.

Jockey Tommy Berry said despite Thronum being wayward in the straight, the horse had dug deep to hold off the fast-finishing Mediterranean.

He said the horse relished the wet track and similar conditions on Golden Rose day would suit.

"Whether he's doing well enough to win it I'm not sure, but hopefully we'll get a wet track on the day and he'll be right in it," Berry said.

Thronum drifted from $2.30 to $3.20 while Mediterranean was backed from $2.10 into $1.80 favouritism.

Mediterranean's defeat denied trainers Peter and Paul Snowden a clean sweep of the first two stakes races of the NSW season after Tycoon Tara won the Group Two Missile Stakes on Saturday.

Bott said he had learned a great deal in his four years working at Tulloch Lodge.

"We were pretty confident coming into today when we saw the rain throughout the week," Bott said.

After being fractious in the barriers last start when second at Canterbury, Thronum left the gates cleanly and Berry took him to the lead.

"We knew that if he jumped cleanly today and took control of the race they wouldn't catch him," Waterhouse said.

Bott said he was unsure if the stable would choose to give Thronum - who now has three wins from four starts - another run before the Golden Rose.

"We'll just weigh up it." he said.

"I'd say he's done enough to get in."