Xavier Johnson made two free throws with four seconds left to give George Mason a 68-63 lead.
Tyler Kolek had 11 points and five steals for George Mason (3-1).
Greg Parham had 19 points for the Keydets (5-4). Kamdyn Curfman added 14 points and Jake Stephens had 14 points, 10 rebounds and four assists.
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