BOISE, Idaho — Wes Clark scored 25 points, Jeremy Harris added 23 and No. 13 seed Buffalo pulled off the biggest upset of the NCAA Tournament’s opening round, rolling over No. 4 seed Arizona 89-68 in the South Region on Thursday night.

The smaller Bulls (27-8) used their quickness to zip around the Wildcats (27-8), scoring at the rim and on kickout 3-pointers.

Defensively, Buffalo neutralized Arizona’s size inside by collapsing on the paint, forcing the Wildcats to shoot from the perimeter. Arizona went 2 for 18 from beyond the 3-point arc, while the Bulls hit 15 of 30.

Buffalo shredded Arizona’s defense at a 55-percent clip for the program’s first NCAA Tournament win.