In the 2013–14 season Lefort won the Challenge International de Paris, his first World Cup medal, and climbed the podium in Venice, Saint-Petersburg and Havana. In the European Championships at Strasbourg, Lefort was defeated in the second round by Denmark's Emil Ulrik Andersen. In the team event, France received a bye, then overcame the Czech Republic and Russia to meet Italy in the final. They prevailed 45–41 to earn the gold medal. A month later in the World Championships at Kazan, Lefort was seeded number two. He made his way to the quarter-finals, where he defeated reigning European champion James-Andrew Davis, but was defeated in the semi-final by Aleksey Cheremisinov of Russia and came away with a bronze medal. In the team event, No.2 seeded France received a bye, then knocked out Hong Kong, Germany and hosts Russia to meet China in the Final. They beat China 45–25 to earn the gold medal. Lefort finished the season No.2 in FIE rankings.