Reefscape produced a smart turn of foot to lift the Group One Prix du Cadran at Longchamp for trainer Andre Fabre.
The four-year-old, partnered by Christophe Soumillon, was the early leader before dropping back and coming with a late thrust.
British raider Alcazar put in a strong finishing flourish in the opening event on Arc day, forcing a photo for the places with Ostankino.