Collinsworth's eight points sparked a 13-0 run midway through the opening half as the Cougars took a 19-point lead. The lead remained in double figures thereafter.
BYU led 42-30 at halftime and opened up the second half with six unanswered points. The Cougars led by as many as 31 points with 8:43 remaining in the game.
Skyler Halford added 17 points, Tyler Haws 15 and Chase Fischer 14 for the Cougars (19-8, 9-5 West Coast Conference), who are alone in third place after Pepperdine lost to Portland Thursday. BYU made 9 of 19 3-pointers and shot 50 percent overall.
Brad Waldow scored 17 points for the Gaels (18-6, 10-3), who are second in the WCC behind third-ranked Gonzaga. Garrett Jackson added 13 points and Kerry Carter 11.