Sirmione, foaled on 25 August 2003 in Australia, is notable for winning the LKS Mackinnon Stakes at 60-1 during the 2007 spring carnival.

He is a bay Thoroughbred gelding by the outstanding sire, Encosta De Lago from World Guide (NZ) by Defensive Play (USA) that was bred by M.F.

Sirmione was sold as a yearling at the Magic Millions sales on the Gold Coast for $300,000 to Bart Cummings.

He is trained by the Cups King, Bart Cummings and raced by owners, J M & T M Xipell, R Covington & L A & S J Smith.

On 3 November 2007 he recorded an upset victory in the Mackinnon Stakes, winning by 1.75 lengths from a field which included Haradasun, Zipping, Railings and Miss Finland.