The Eagles (17-8, 10-5 Southern Conference) went on a 17-5 run, capped by a Dwayne Foreman free throw to claim a 30-17 lead with 6:30 left in the first half.
Georgia Southern opened the second half by outscoring the Mocs 26-4, taking a 62-36 lead. The Eagles also held Chattanooga (15-10, 10-5) without a field goal until 10:18 was left in the half.
A Zach Ferrell 3-pointer cut the deficit to 70-52 for Chattanooga, but didn't trim the lead anymore.
Willie Powers scored 15 points for Georgia Southern, while Matthew Fields added 10.