Livingston snapped a tie with six consecutive points to give the Patriots (9-9, 3-2 Atlantic 10) an 83-77 lead with a minute to go. Davell Roby responded with a 3-pointer and the Billikens (8-10, 1-4) used their pressure to get a turnover but Saint Louis missed three final 3-point attempts.
Greg Calixte added 11 points for George Mason, which shot 54 percent and made 9 of 20 from behind the arc. Livingston was averaging 26 points over his three previous games and hit that mark while dishing seven assists.
Saint Louis led 39-38 at halftime.
Zion Williamson runs the floor and rises for an alley-oop dunk in the fourth quarter.
R.J. Barrett flies high in the third quarter with an alley-oop slam and a one-handed flush within a minute.
Zion Williamson and R.J. Barrett play give-and-go on a fast break, finishing with a sweet alley-oop dunk.