Tough Sydney stayer Supply and Demand has continued to amaze with his ability to handle increasing distances by winning the Listed Caloundra Cup (2400m).

Jockey Josh Parr went straight to the lead on the gelding ($3.80), which ran the field into the ground winning by 1-3/4 lengths to My Diamantine ($12), with War Baby ($15) three-quarters of a length back in third.

The failure of the race on Saturday was Victorian galloper Self Sense ($3.50), which had won the Ipswich Cup by nearly seven lengths at his previous start.

Self Sense was never a chance and finished second last.

"I think there are two of him. He didn't seem interested in racing today," jockey Michael Cahill said.

Supply and Demand is trained by the Adrian Bott and Gai Waterhouse partnership and has been one of their stars in the Sydney winter.

He won his two previous starts in Sydney with tough displays and convinced the partnership to send him north.

Stable spokesman Neil Paine said Supply and Demand had continued to surprise with each run.

"He won at 1800 metres at Rosehill and we were a bit worried about him at the that distance. Then we stepped him up to 2000 metres and again there was a question he would run it," Paine said.

"Supply and Demand won both of those races and we stepped him up to 2400 metres, which was again a question."

"He isn't built like a stayer but he is all heart."

Paine would not commit Supply and Demand to the Queensland Cup over 3200m in two weeks.

"Gai is back from overseas on Tuesday and she will work things out with Adrian then," he said.