ROBERT THOMPSON has ridden plenty of good gallopers in the past 30 years and he left Doomben yesterday adamant that Youthful Jack has the potential to be the best yet.

Thompson revealed his assessment after he had guided Youthful Jack to a cruising win in the $150,000 Vo Rogue Plate (1350m).

"That's the difference between good horses and great horses," Thompson said. "He was three or four lengths off them one stride and in the next he's picked them up.

"He had a bit of a bludge once he hit the front and I have no doubt at all there is plenty of improvement left in him. He could be easily be a topliner."

Starting the well-supported $1.40 favourite, Youthful Jack settled near the rear of the field but quickly gathered the leaders in at the 200 metres to score a soft half-length win.

Emerging Toowoomba filly Express Air ($6) finished gamely for second in front of Yatala.

Senior owner Ross Stitt, deputising for winning trainer Allan Denham, said Youthful Jack had accomplished his Queensland goals and confirmed the horse would return to Sydney within days.

"There are plenty of three-year-old races coming up for him next year and he'll have a freshen-up for a couple of weeks now," Stitt said.

Hulking Brisbane filly Paprika silenced a few of her doubters and justified Magic Millions favouritism with a comprehensive victory in the $150,000 Tommy Smith Slipper at the Doomben track.

Paprika went into the 1200m race with three wins from three starts but there were plenty of cynics who doubted the General Nediym filly's stamina beyond 1000m.

But Paprika left the doubters with little ammunition to support their argument when she bounded straight to the front for jockey Shane Scriven and sprinted away from her main rival, Carlton Forward, to score by two lengths.

Carlton Forward lost no admirers at his first start going the clockwise direction when he tracked Paprika throughout and knuckled down bravely in the straight.