The Patriots (10-8, 4-1 Atlantic 10 Conference) improved to 3-0 on the road in conference play. UMass (7-10, 0-4) has lost six of its last seven games.
Kier was 8 of 12 from the floor and Greene 6-of-11 shooting, and the duo each had eight of George Mason's 35 rebounds. Otis Livingston II chipped in with 12 points and four assists.
Trailing 54-50 with five minutes left, Greene hit a 3-pointer to spark a 13-2 run and the Patriots led 63-56 with 2:38 left. Layups from Holloway and Jonathan Laurent pulled the Minutemen to 63-60 with 57 seconds remaining. Kier scored on the next possession and then Greene's free throw made it 66-60 with 18 seconds to go.
Pierre hit another 3, but Livingston made a pair of free throws to seal it.
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