Havana Gold swooped late to take Group 1 honours in the one-mile Prix Jean Prat at Chantilly for trainer Richard Hannon.
One of three runners carrying the colours of Qatar Racing, Havana Gold (6-1) collared San Marino Grey (11-1) close home under Mickael Barzalona to gain a first win at the top level.
Mondialiste (150-1) stuck on well after carrying out pacemaking duties for the Freddie Head stable to claim third spot while the 7-4 favourite Style Vendome was fourth.
Aidan O'Brien's UAE Derby winner, Lines Of Battle, who was runner-up to yesterday's Irish Derby winner, Trading Leather, over 10 furlongs last time out, was always struggling to go the pace and could not get involved.
David Redvers, racing manager to the Qatar operation, said: "He deserved it, and he won it like a horse that deserved it. It's great.
"We are absolutely thrilled. It's one of the highlights of our time for Qatar Racing to do that here with that horse.
"He was the king of the paddock walking round and was the king on the racecourse, so we're delighted.
"I've got to talk to Richard (Hannon) about plans. He's convinced he'll stay further, but he's good at a mile so we will just have to see what we come up with.
"The Jacques le Marois is a possibility, but equally there are other races as well.
"We'll probably look at something over a stiff mile for him."