
He showed good tactical speed to travel in second place and was strong to the line for Blake Shinn.
"He's a full brother to our Group III winner Stampede and to do what he's done today over this distance augers very well for his future," said Adrian Bott, who indicated Derby goals next season were in the pipeline for the promising colt.
Thinkin' Big was bred and retained to race by Peter Dunn of Dodmark Thoroughbreds and was foaled at Coolmore.
He is the second winner for classy Tale of the Cat (USA) staying filly Nothin Leica Cat, who was second in the Group I BRC Queensland Oaks and is from a half-sister to Group II winner I Am a Ripper.
Nothin' Leica Cat has a weanling filly by So You Think and was covered last spring by American Pharoah (USA).