Dee shot 9 of 14 from the field and 6 for 9 from 3-point territory for the sixth-seeded Toreros (13-17), who play No. 3 seed BYU in a quarterfinal game on Friday. Ken Rancifer added 12 points.
The No. 7-seeded Waves (10-19) were led by Corbin Moore, who had 16 points and 12 rebounds. Taylor Darby added 15 points and eight rebounds, and Jordan Baker scored 12 points.
Christopher Anderson had six points, eight assists and three steals for San Diego. Chris Manresa had six points and nine rebounds.