CORVALLIS, Ore. (AP) Oregon State coach Wayne Tinkle said a 13-day stretch without a game during winter break paid off thanks to hard work during practice.
Tres Tinkle, the coach's son, scored 19 points to lead Oregon State to a 70-57 victory over Oregon in a Pac-12 Conference opener on Sunday night.
Olaf Schaftenaar had 13 points and a career-high eight rebounds, and Gary Payton II added 12 points and six assists for the Beavers (10-2, 1-0 Pac-12), who won their fourth-straight game and broke a four-game skid against the Ducks.
''We've been talking about having some leadership emerge in practice every day, which would lead to game time and more of a 40-minute effort,'' Tinkle said. ''Our guys took it to the court and we were really focused.''
Chris Boucher scored 14 points to lead the Ducks (11-3, 0-1), who had a four-game winning streak snapped. Dillon Brooks added 13 points.
Oregon State outrebounded Oregon 37-32, and limited the Ducks to 35.8 percent shooting, compared to 44.4 percent for the Beavers, who had five players in double figures.
''Everybody kind of contributed,'' said Oregon State's Langston Morris-Walker, who had 12 points.
Oregon coach Dana Altman criticized his team's effort. ''Our movement and execution were poor. . We got beat on the boards. The turnovers were bad. There's not one thing where I can say we did a good job,'' Altman said.
Oregon State led 18-10 after a seven-point run, capped by a Stephen Thompson Jr.'s 3-pointer at the 10:44-mark. At that point, the Ducks had already committed five turnovers, which led to half of the Beavers' points.
A 10-0 surge put the Beavers up 31-14 with 4:56 remaining in the first half.
Oregon State led 34-19 at the break, and Payton, the team's top player, hadn't scored.
The Ducks went on a 12-3 run early in the second half, capped by a Boucher tip-in, to pull to 40-31 with 13:30 left. Oregon never got closer than eight points the rest of the game.
The game was the 345th meeting between the teams, making the Civil War the most-contested matchup in college basketball. The series dates back to 1903 and the Beavers hold a 186-159 edge in the rivalry.
Oregon: Dillon Brooks, a sophomore, has scored in double figures in nine straight games. . The Ducks have already seen 22 games missed to injury this season, compared to three for the 2014-15 campaign. . Oregon is in the midst of a schedule that includes 23 of 28 games against teams currently in the ESPN top 100.
Oregon State: The Beavers' 13-day stretch between games was the longest since a 14-day break in 1980. . Entering the game, Oregon State's second, third and fourth leading scorers were freshmen Tres Tinkle (11.6 points per game), Stephen Thompson Jr. (9.3) and Drew Eubanks (8.5). Thompson finished the game with 10 points and Eubanks had four points and five rebounds.
Oregon coach Dana Altman said the Ducks missed the leadership of Joseph Young, who graduated after being named the Pac-12's player of the year last season. ''We didn't have anybody getting the team ready, anybody that kept the guys going during the game, anybody that was encouraging them to turn it around,'' he added.
Tres Tinkle has averaged 16.8 points in his last five games. The freshman averaged nine points in the Beavers' first seven games.
DROP IN 3-POINT SHOOTING
Oregon State shot two 3-pointers in the second half. ''We got much more aggressive in attacking the rim, and we were rewarded. We got to the free-throw line and we got some higher percentage shots,'' Oregon State coach Wayne Tinkle said.
Oregon hosts California on Wednesday.
Oregon State hosts Stanford on Wednesday.