Georgetown built a 25-point second-half lead, only to see it dwindle to three with 18 seconds left. The Hoyas made four straight free throws to seal it.
Smith-Rivera was 7 of 12 from the floor and 12 of 15 from the line. Marcus Derrickson added 15 points on five 3-pointers. Georgetown (6-3) was 10 of 20 beyond the arc and shot 49 percent from the floor.
The teams were sluggish at the start, combining for 15 points over the first six minutes. Smith-Rivera heated up, scoring 10 points in a row and 13 of 15 and the Hoyas led 38-28 at intermission. Smith-Rivera's 3-pointer gave Georgetown a 25-point cushion with 8:14 to go and the Hoyas withstood a 19-3 run late.