Despite not jumping the fastest, Corykodi hunted up the rail and got to an early lead, which proved the difference as second favourite Just Browsing checked back through the field.
Favourite for the race Despacito failed to jump away cleanly from box five and was never in the hunt.
Corykodi returned $5 at online bookmaker Sportsbet.
Haldane, who said the winner “wasn’t the best dog in it”, prepared the dog for long-time friend, Queensland owner Claude Dacey.
The trainer said the speedy beginning won Corykodi the race.
“I’m rapt for the dog – he’s a very good dog,” Haldane said.
“He met a hard field and he wasn’t the best dog in it but he’s got early pace and that’s what won him the race.”
The Lauderdale-based trainer, who only has two dogs in his own kennel, revealed Corykodi will run again on Monday night and if all goes to plan they will target another Group race in Tasmania.
“If he goes alright we’ll keep him here (for the Launceston Cup), if not he’ll go back to Queensland.”
WATCH BELOW: Corykodi wins the 2019 Devonport Cup