The Open 13 was an annual men's tennis tournament played in Marseille, France. The tournament was an ATP Tour 250 series event on the Association of Tennis Professionals tour. The number 13 is the INSEE code of the Bouches-du-Rhône département of which Marseille is the capital. It was held for one week in February at the Palais des sports de Marseille on indoor hardcourts, where the Centre Court has a capacity of 5,800 seats. The tournament was held from 1993 until 2026 when it was relocated to Lyon.