Blake scored nine straight points, starting a 16-2 run for the Vandals (6-2) and a 22-6 lead barely five minutes into the game. They hit 4 of 5 3-pointers to that point. They ended the first half with a 13-0 run that included three treys, two by Blake, for a 49-20 lead.
Blake scored 18 points in the first half on 7-of-11 shooting, including all four of his 3-pointers. The Vandals made 9 of 13 3-pointers and shot 51 percent (20 of 39) while the Cougars were at 39 percent (12 of 31), going 4 of 16 from distance.
"I was just locked in and focused, my teammates were helping me, got me the ball," Blake said. "Just hard work, hard work is paying off, so I am just blessed."
The Cougars (6-2) used a 3-pointer from Carter Skaggs and a 3-point play by Robert Franks to get it to 14 on two occasions in the first three minutes of the second half but Sanders had a 3 and five points in a 7-0 run to push the lead to 21 with 15 minutes left and Washington State never challenged.
"It's a long season, you don't get too up when you are 6-0, you don't get too down, you just get ready for the next one," said WSU Coach Ernie Kent.
Perrion Callandret added 16 points with five rebounds and five assists for the Vandals.
Franks led the Cougars with 16 points.
"I told the players before this week started that players circle games on their schedules, I circled this week," said Idaho Coach Don Verlin. "We went to Nicholls State on Sunday all away across the country, we come home for our rivals on Wednesday and we have to go visit the WAC champions on Saturday."
Washington State: The Cougars put themselves in holes early the last two games trailing by 17 points to UC Davis and 19 points to Idaho at the half, losing two straight after winning their first six, including the Wooden Legacy Tournament Championship.
Idaho: The Vandals had a 43-31 rebounding advantage and had 20 assists with just nine turnovers. ... Trevon Allen had a huge block that ignited the crowd, followed by a fast break layup from Sanders on the other end to give Idaho a 22-point lead.
Idaho and Washington State have the oldest continuous rivalry west of the Mississippi River. The teams met for the 113th-consecutive season. The win by Idaho is the third largest in rivalry history and largest since 1963.
Washington State: The Cougars will play at UTEP on Saturday.
Idaho: The Vandals go on the road to face CSU Bakersfield on Saturday.
LAC VS GS
Gist scores 21 as Iona cruises past Marist 90-77
Asante Gist came off the bench to hit four 3-pointers and score 21 points, matching his season high and leading six players in double figures, and Iona continued its dominance of Marist with a 90-77 victory on Friday.
Law hit go-ahead basket as Northwestern holds off Rutgers
Vic Law shook off a dismal shooting night to hit a go-ahead drive with 4:25 to play and Northwestern held off Rutgers 65-57 on Friday night after twice blowing 10-point seconds-half leads.