"It's good to make outside shots against the zone," Arizona State coach Herb Sendek told the Associated Press.
"We've been leading this league in 3-point field-goal percentage playing a large majority of zone -- you find shooters, you communicate, you find who is in your area and you get to him," said Oregon State coach Wayne Tinkle. "Tonight we didn't. We short-closed on guys that stuck them in our face and we lost them in transition."
Arizona State (11-10, 3-5) used an 18-3 run early to take a 40-23 lead into the break and extended it to as many as 22 points in winning its third game in the last four.
Oregon State never got closer than 15 in the second half.
Arizona State hit five straight 3-pointers in one stretch to open up a 21-10 lead in the first seven-plus minutes of the game. The Sun Devils trailed off after that, making 9 of 24 from beyond the arc on the night, but the damage was done.
Gary Payton II had 23 points to lead the Beavers (14-6, 5-3), who had won three straight.
Four Sun Devils had at least two 3-pointers.
The Beavers missed 9 of 12 shots during a first-half stretch, trailing 38-18 at that point.
Malcolm Duvivier added 14 points for Oregon State before fouling out with 4:38 left.
"Disappointed in our effort, in our lack of focus, and I thought our leadership out on the floor wasn't where it's been," said Tinkle. "We had too many guys who had off nights. But you can't have off nights offensively and carry it to the defensive end."
Arizona State outrebounded Oregon State 35-22.
UP NEXT: Oregon State is at No. 6 Arizona on Friday. The Wildcats are hell-bent on revenge after the Beavs shocked them 58-56 on Jan. 11 in Corvallis.