Ridden by Michael Hussey, he took the lead inside the final furlong and won by two and a half lengths from the Jim Bolger-trained Fiscal Focus, with Gypsy King in third.
He finished half a length behind Free Port Lux but beat eventual Grand Prix de Paris winner Gallante into third place.
A month later Adelaide started the favourite for the King Edward VII Stakes at Royal Ascot but finished second place behind Eagle Top.
Ridden by Colm O'Donoghue, he took the lead in the straight but was overtaken inside the final furlong and was beaten a neck by the 23.5/1 outsider Mr Speaker.
[6] The colt bypassed the Arc and was sent to Melbourne to contest Australia's premier weight-for-age race, the Cox Plate over 2040 metres at Moonee Valley Racecourse on 25 October.
Moore dropped the horse to last place in the early stages before making steady progress and moving up on the outside to dispute the lead on the final turn.