Jockey Stathi Katsidis predicted a big spring in Sydney for talented three-year-old Fifteen Carat following his commanding victory in Saturday's Listed Sunshine Coast Guineas Plate.Fifteen Carat unleashed a powerful finish to add another string to Katsidis' interstate spring bow with a three-quarters of a length win over Startling Pleasure in the 1600-metre feature at Caloundra.Fifteen Carat is part-owned by Katsidis' fiancee Melissa Jackson who was too nervous to watch the race."I don't watch h

Jockey Stathi Katsidis predicted a big spring in Sydney for talented three-year-old Fifteen Carat following his commanding victory in Saturday's Listed Sunshine Coast Guineas Plate.

Fifteen Carat unleashed a powerful finish to add another string to Katsidis' interstate spring bow with a three-quarters of a length win over Startling Pleasure in the 1600-metre feature at Caloundra.

Fifteen Carat is part-owned by Katsidis' fiancee Melissa Jackson who was too nervous to watch the race.

"I don't watch his races and that's why it's been a big year for him," Jackson said.

Katsidis was successful on Gold Coast stayer Shoot Out in the Group One AJC Australian Derby and Group One Randwick Guineas during the autumn and hopes to maintain his association with Fifteen Carat interstate.

However that will depend on what races trainer Howard Wilson chooses for Fifteen Carat in Sydney with Katsidis heading to Melbourne to ride Shoot Out in his Cox Plate campaign.

"He'll go for a spell now and then go to Sydney for the spring but I honestly don't know for what races," Wilson said.

"I was thinking about Melbourne but that's off the agenda now."

Wilson bought Fifteen Carat for $29,000 at the Magic Million sales which now looks to be a cheap purchase.

"He went cheaply because a lot of people thought he had an abscess under his throat and thought it may have been strangles," he said.

"But I knew it was just a grass seed which had got caught."

Wilson had considered aiming Fifteen Carat for last month's Group One Queensland Derby at Eagle Farm but changed his mind at the last minute.

"He's a very good horse and he was ridden too close to the lead when he failed in the (Group Three) Chairman's," Wilson said.

"He ran a great race to finish third in the Queensland Guineas behind Rothesay but I still think he could have beaten him if he could have been a little closer."

Katsidis believed Fifteen Carat had the scope to develop into a Group One contender this spring.

"He's very good but right now I'd rate him a Group Two or Group Three horse," Katsidis said.

"But I think he can go to the next level with a little more improvement."