Noah Dickerson had 20 points and 12 rebounds, and ninth-seeded Washington made a successful return to the NCAA Tournament for the first time in eight years, beating Utah State 78-61 on Friday.
After struggling in the first half, Washington (26-7) kicked its long-armed, swarming defense into a faster gear and the fifth-seeded Buffaloes (21-12) had trouble handling it.
Jaylen Nowell scored 24 points, David Crisp added 18 and Washington held off a late charge to beat Southern California 78-75 in the Pac-12 tournament quarterfinals on Thursday.
UW won the Pac-12 Regular Season Championship and clinched the No. 1 seed in the Pac-12 Tournament.
It is the first time in the 16 years that the Pac-12 has given out a Defensive Player of the Year award, that a school has won Coach of the Year, Player of the Year and Defensive Player of the Year in the same season.