Wiesentraum stunned punters with a shock 40-1 success in the 'In Loving Memory of Scott Dobson' Beginners' Chase at Doncaster.
Victory looked out of the question for most of the race as Lucy Wadham's six-year-old was struggling at the rear of the field on his debut over fences.
However, he picked up noticeably for Dominic Elsworth in the long straight and collared Vintage Star close home to prevail by a neck.
Wadham's husband and assistant Justin said: "He's a good ground horse, which is why we came here, and I think he wants further. His jumping got better as the race went on and he will improve for better ground.
"This was surprising, so we'll stick to novice chasing, but it depends on the ground. He's a good-actioned horse."
Connections have Cheltenham Festival aspirations after Rocky Creek opened his account over fences in the Healthwatch Doncaster Novices' Chase. Runner-up to Harry Topper at his first try at the bigger obstacles, the Paul Nicholls-trained gelding beat a small but select field in good style.
Daryl Jacob always had the 4-6 shot up with the pace and though Molotov tried to make a race of it, Rocky Creek was too strong and strode away to win by four lengths, with Attaglance 15 lengths away in third.
"The form of the Exeter race has worked out well with the winner winning a Grade Two chase at Newbury," said Nicholls' pupil assistant Tom Jonason.
"It's not been straightforward between Exeter and here, but hopefully he will turn into a Festival horse in March. Between now and then he's got time to have two more runs. There were a couple of good benchmarks in there."
Stan James cut Rocky Creek to 14-1 from 20-1 for the RSA Chase at Cheltenham.
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