In the colours worn by former Caulfield Guineas and champion sire Redoute's Choice, Mighty Boss scored a shock win in the A$2 million classic for 3-year-olds.
The Mick Price-trained colt was an emergency for Saturday's 1600m race and gained a start after the scratchings of Summer Passage and Eclair Sunshine.
Sent off the $101 rank outsider under Michael Walker, Mighty Boss got up on the inside to score by a neck in front of Kementari ($5.50), with the $4.40 favourite Catchy a length further away in third.
Price parted with $170,000 at New Zealand's premier yearling sale in 2016 and was able to keep 10 per cent of the ownership.
"If you look at the horse he's a bit blond and a bit flashy and I thought all the good judges won't be liking that," Price said.