Voix de Nord came back from an injury that caused trainer David Smaga serious worry to win a thrilling Prix Lupin (Fr-I) by a nose over Millemix at Longchamp Sunday.The French-bred 3-year-old colt by Valanour, who was ridden Sunday by Dominique Boeuf, colt now boasts back-to-back group I wins after capturing the Criterium de Saint-Clouds in November.Voix de Nord overcame a foot injury while winning last month's Prix Noailles and was questionable for Sunday's 10 1/2-furlong event. "For seven days it was very difficult," Smaga told The Racing Post. "I checked him every night hoping that he had improved but he was just getting more and more lame and I really thought that his spring was finished. To win after that shows he has the mark of a champion - I think he's a great horse."He won a duel of bobbing heads after collaring Millemix in the final 150 yards. The two expect to meet again in the French Derby.Two lengths behind was Valixir.The time was 2:08.5 on good to soft going. Only five competed, with Ballydoyle's Esperanto fourth and Alcinos trailing.