Boulogne-Levallois was beaten on the first day of the Eurocoupe (C2).
Traveling to Ankara, to challenge Turk Telekomspor, the Ile-de-France residents lost eight points (73-65).
A frustrating defeat for the Metropolitans 92, who led up to eight units in advance during the second quarter.
But the locals made their comeback at the end of the third before never being joined again in the fourth.
Vincent Collet and his men will have an opportunity to recover in eight days at home against the Poles in Wroclaw.