Irish horse Sir Isaac Newton will carry Lloyd Williams' navy and white colours in the Caulfield Cup with the Australian businessman joining Coolmore in the ownership.
The Aidan O'Brien-trained five-year-old is on the fourth line of betting at $12 for Saturday's $3 million handicap over 2400 metres.
Williams, his wife Susie and son Nick, are now partners with Sue Magnier and Michael Tabor in Sir Isaac Newton.