Gonzaga (21-3, 11-1 West Coast Conference) gained revenge for a Jan. 9 loss to the Pilots.
David Stockton and Angel Nunez also scored 13 points for the Bulldogs, who have a three-game lead in the West Coast Conference.
It was Gonzaga's seventh straight win.
Portland (13-11, 5-7 WCC) lost for the third time in four games. Ryan Nicholas led the Pilots with 15 points and 15 rebounds.
Members of Congress to keep receiving porn magazine
Rosie O'Donnell unveils nearly 50-pound weight loss