The Cardinals (5-3) posted a 27-14 lead by halftime. Liberty's 14 points was its fewest in a half since also scoring 14 in 1991.
Lamar outscored Liberty 38-16 on points in the paint - 10-2 in the first half.
Liberty (3-8) jump-started its shooting game from 17.6 percent (3-for-17) in the first half to 67 percent (16-for-24) in the second, though the Flames were unable to get any closer than eight points. The Liberty losing skid stretched to seven games.