Jordan Bachynski added 12 points for the Sun Devils (20-7, 9-5 Pac-12).
Arizona State finished the first half with a 14-3 run to lead 36-22 at the break and was up by as many as 21 before Washington State cut it to eight in the late going.
The Sun Devils, one of the worst free-throw shooting teams in the country this season, sealed the win with eight straight in the final 1:35.
Colosseum Athletics Men's Arizona State Sun Devils Black Layup ShortsPrice: $24.99 Shop
Tim Legler and Brad Daugherty analyze Ben Simmons and Brandon Ingram, the top two picks in the NBA draft, and agree that Simmons will have a more immediate impact.
Dickie V likes the idea of Oklahoma star Buddy Hield teaming up with Anthony Davis in New Orleans. What did he think of other teams' selections?
76ers general manager Bryan Colangelo explains how No. 1 overall pick Ben Simmons will impact the Sixers and how Simmons can facilitate on the floor.