Kevin Foster scored 26 points and Evan Roquemore 24, and they combined for nine of the Broncos’ 11 3-pointers. Harrison added 19 points for Santa Clara (3-1).
Tony Snell scored 18 points for New Mexico (2-2). Hugh Greenwood added 14.
Harrison broke an overtime tie to make it 76-74 with his free throws. Raymond Cowels was fouled moments later and hit two free throws to give the Broncos a four-point cushion.
Jamal Fenton made two free throws for the Lobos, who then intentionally fouled Foster. He split his free throws, putting Santa Clara up 79-76.
New Mexico called time to set up a final play. Phillip McDonald got a good look, but his 3-pointer hit the back of the rim.