Harry Topper won the Denman Chase at Newbury by 25 lengths in testing ground for trainer Kim Bailey.
The 7-2 chance, ridden by Jason Maguire, relished the going and will run in next month's Cheltenham Gold Cup should similar conditions prevail.
Favourite Al Ferof, for Paul Nicholls, finished a distant second in the five-runner race.
Walkon was fourth, a placing which means he has passed the qualification criteria for April's Grand National.
Module won the Game Spirit Chase under Paddy Brennan for trainer Tom George in a tight finish from Dodging Bullets.
The winner was headed after the last but battled back to get the result.
Splash Of Ginge sprang a 33-1 shock in the Betfair Hurdle with Ryan Hatch riding the winner for Nigel Twiston-Davies.
Before racing, the retired two-time Hennessy Gold Cup winner Denman and current champion chaser Sprinter Sacre paraded in the paddock.