Shelvin Mack scored 20 points to pace Butler to an 84-68 victory over Washington State in the championship game of the Diamond Head Classic on Saturday night.
A 15-0 second-half run fueled the Bulldogs (9-4) to their fifth straight win.
Klay Thompson scored a game-high 31 points to lead the Cougars (10-2), whose five-game winning streak ended.
Butler, which made a magical run in last season's NCAA tournament before losing to Duke in the national title game, shot 50 percent from the field, including 11 of 27 on 3-pointers.
The Bulldogs scored on their first six possessions of the second half, including three straight 3-pointers. Two came from Zach Hahn, who finished with 14 points. Andrew Smith and tournament MVP Matt Howard also had 14 points. Mack and Thompson also made the all-tournament team.
Florida State defeated No. 15 Baylor for third place.