Gravelines followed up their midweek win over Cholet with an 80-79 triumph over Reims on Saturday.
Tyson Wheeler had 20 points for the winners, who were a scintillating 13 of 25 (52%) from the arc.
Gravelines now have four victories in five games and will be in upbeat mood ahead of their first EuroCup game against Dynamo Moscow Region this week.
Cholet will also be in EuroCup action at CSU Asesoft and will travel with confidence after an 85-72 triumph at Chalon/Saone.
Lamayn Wilson tore apart Chalon/Saone by scoring 35 points.
Defending French champions Strasbourg's struggles continue. They lost 83-71 at Le Havre - their third defeat in six games.
Pau-Orthez won for the fourth time in six games, 100-65 over Roanne. Dijon defeated Paris Basket Racing 81-67, Brest lost 94-78 at home to Hyeres-Toulon, Adecco Asvel thrashed Bourg 91-70 and Clermont won at Rouen, 70-61.