Chris Patton chipped in 10 points for the Highlanders (6-20, 3-11 Big West), who rebounded from a 75-35 loss to Long Beach State -- the fourth game this season in which Riverside scored 40 points or fewer.
Alan Williams had 15 points and 12 rebounds for the Gauchos (8-17, 4-10), including two free throws with 14:28 to play that put Santa Barbara ahead 32-29. But Riverside scored the next nine points -- six of them by Harriel -- to take the lead for good. The Highlanders were 8 of 8 from the free-throw line in the final 1:57 to secure the victory.
Riverside held Santa Barbara to 26 percent shooting and won despite committing 18 turnovers.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.
Mike Brey is looking at former Notre Dame players to fill two assistant jobs that have opened up with the departures of Martin Ingelsby and Anthony Solomon.
Purdue's 2016-17 prospects got a jolt Wednesday when forward Caleb Swanigan announced he will return for his sophomore season.