Leading trainer Peter Moody has revised spring plans for exciting three-year-old Doubtful Jack after he demolished his older rivals to win the Listed Winter Championship at Flemington in a canter.Jockey Luke Nolen eased down the prohibitive $1.60 favourite Doubtful Jack over the last 50 metres to a 6-1/2 length victory over Pinnacles ($26) and Riceman ($14) in Saturday's $200,000 1600m feature.Nolen said it was the easiest win he had been associated with since the Peter Hayes-trained Old Tawny s

Leading trainer Peter Moody has revised spring plans for exciting three-year-old Doubtful Jack after he demolished his older rivals to win the Listed Winter Championship at Flemington in a canter.

Jockey Luke Nolen eased down the prohibitive $1.60 favourite Doubtful Jack over the last 50 metres to a 6-1/2 length victory over Pinnacles ($26) and Riceman ($14) in Saturday's $200,000 1600m feature.

Nolen said it was the easiest win he had been associated with since the Peter Hayes-trained Old Tawny scored in similar fashion by six lengths at Flemington in June 1999.

"He did it just so easily," Nolen said.

Moody was so impressed with the performance that he now has Group One spring plans for Doubtful Jack who has won his last three starts at Flemington by an aggregate of 16-1/4 lengths.

"I think he has booked himself in for a spring carnival," Moody said.

"He couldn't have been more impressive his past three starts but I am not surprised.

"I always thought the horse had good ability but the leap he has made in the last six weeks has been phenomenal.

"You have got to take into account it is winter form but you have to go to the spring with form like he's got.

"He has been doing it comfortably and it seems so effortless.

"It has been a great transition."

Doubtful Jack has won six of his 12 starts but his improvement since travelling to the Gold Coast for an unsuccessful crack at the Magic Millions Trophy in January has been astounding with him winning four of his five runs this campaign.

"He has matured nicely off that summer break and come back a much better horse," Moody said.

"His form is good enough to win a nice race in the spring but if he improves again he might win a good race in the spring.

"My initial thoughts were that with this type of horse you usually race on and try and tackle those early weight-for-age races when the other horses aren't up to their mark, but the way he has gone today we might have to give him a bit more of a break and aim him at a race like the Toorak."

He said the Group One Toorak Handicap at Caulfield in October was particularly attractive as it was Group One and Doubtful Jack would be handicapped not far off the minimum weight.