Oregon State holds on to beat George Mason 58-54
Devon Collier added 15 points for Oregon State (7-3).
Bryon Allen had 15 points and Patrick Holloway hit four 3-pointers to finish with 12 points for George Mason (5-6).
Collier's layup with 1:56 left gave Oregon State a 50-49 lead. George Mason's Marko Gujanicic missed a 3-point attempt on the next possession and Nelson hit a jumper as the shot clock expired to extend the lead to 52-49 with 41 seconds remaining.
Allen made two free throws with 31 seconds left to cut the deficit to 52-51. Nelson made two free throws to extend the lead to 54-51 with 29 seconds. George Mason couldn't convert on its next possession and Nelson made four more free throws to seal the win.
Nelson was 6 of 6 from the free throw line in the game's final 29 seconds and converted all 10 his attempts in the game.
The Beavers led by nine midway through the first half but the Patriots rallied to tie it twice in the final two minutes of the half. Holloway's 3-pointer gave the Patriots, who had 10 first-half turnovers, a 29-28 lead at halftime.
The Beavers played without senior starting center Angus Brandt, who suffered a leg injury in Sunday's loss to Akron. Brandt is averaging 12 points per game and is the team's third-leading scorer.
Malia and Sasha Obama, the daughters of President Barack Obama, attended the game without their parents and sat behind the Oregon State bench. Beavers coach Craig Robinson is the older brother of first lady Michelle Obama. The president and his family attended Sunday's Oregon State game against Akron.