Mick Channon's Luhaif could finish only fifth in the Group Three Prix de Conde at Longchamp on Sunday.
Jockey Sam Hitchcott was keen to make the running in the Group Three over nine furlongs, but he was soon in trouble once the pace quickened along the home straight.
Morandi, trained by Jean-Claude Rouget, travelled smoothly in Luhaif's slipstream and could not have won with any more authority when sent on his way by Gregory Benoist.
The Holy Roman Emperor colt scored by a winning margin of 12 lengths to take his career tally to three wins from five starts and he is yet to finish outside the first two.
Benoist narrowly missed out on a big race double on the card after his mount, Sediciosa, was narrowly beaten in the Group Two Prix du Conseil de Paris.
The pair finished four lengths clear of the third but the pair went down by a short-head to Freddy Lemercier's Saga Dream who was last seen finishing almost 10 lengths behind Cirrus Des Aigles in the Prix Dollar.
