Top Seed took the lead soon after the start and had a three-length advantage with two furlongs to go, eventually finishing fourth. Voix Du Nord was racing in fifth before asked for his run a furlong from home.Smaga's last group I win was with Marildo in the 1994 Prix Ganay.
"That's a nice way to end the season in France," he told The Racing Post. "He's a very tough and consistent individual. The longer the better and next year he will have a program which will take in the Prix Greffulhe and Lupin."
Boeuf, who won the race for the sixth time, added: "I said after we won in August that Voix Du Nord would win a group I race in the autumn when the ground is softer and the distance longer." Baron T van Zuylen de Nyevelt bred and owns the French-bred bay by Valanour.