Robert Smerdon was left lamenting what could have been after Politeness' win at Caulfield on Saturday.

Politeness was being set on a path to the rich mares' races in Sydney before her preparation was derailed due to injury.

Ridden by Dwayne Dunn and having her first start since February, Politeness ($13) charged home to score a three-quarter length win over Thermal Current ($6) in the Bel Esprit Stakes.

Instead of chasing Group One glory in the Coolmore Classic and the Queen of the Turf Stakes in Sydney, Politeness will now head to Adelaide for the Sangster Stakes (1200m) at Morphettville on May 2.

Smerdon said Politeness had shifted a plate and stood on the nail after a track gallop, causing an abscess.

"We thought we had her right and we'd do a bit of fast work and then have to back off her again," Smerdon said.

"It was frustrating but it was a problem that we identified and had to work through.

"You are dealing with animals, and a lot of variables, and sometimes it works for you and sometimes not."

Smerdon said he was confident the mare was back on track but was concerned she may not have had the sharpness for the 1100m at Listed level.

He said Morphettville in two weeks over 1200m looked an ideal option.

"A tough Morphettville 1200 where you really can close over the top of them really suits her," Smerdon said.

"And any rain would be a bonus."

Following her Adelaide sojourn Smerdon said Politeness was likely to head north to Brisbane for the winter carnival.

Politeness gave Smerdon a double after Fontein Ruby took out the Thoroughbred Breeders Victoria VOBIS Gold Reef.

Dual Group One Trust In A Gust remains Brisbane bound despite a last-stride defeat as an odds-on favourite in the VOBIS Gold Sprint.

Trainer Darren Weir was happy with the performance after his condition gave out in the final 50m.

Craig Williams grabbed top spot on the city jockeys' premiership when Amorino gave him a winning double in taking out the Listed Anniversary Vase.