CORVALLIS, Ore. (AP) -- Alexis Serna kicked a 40-yard field goal with 1:12 left, Ben Siegert blocked Oregon's potential game-winning kick less than a minute later, and the Beavers held off the Ducks 30-28 Friday in the 110th edition of the Civil War.
Oregon's Matt Evensen attempted a 44-yard field goal with 20 seconds left, but Siegert knocked it down and the home team won this in-state rivalry for the 10th straight season.
Leaf led a fourth-quarter drive, capped by a 26-yard scoring pass to Jordan Kent and a QB keeper for a two-point conversion, that put the Ducks (7-5, 4-5 Pac-10) up for the first time in the game, 28-27.
Oregon State (8-4, 5-3) took the ball down to the Ducks' 22 and settled for Serna's 40-yarder in a driving rain. It proved to be enough.
Matt Moore completed 16 of 22 passes for 255 yards and one touchdown for the Beavers, who have won six of their last seven games.
Leaf completed 25 of 42 passes for 274 yards and a score. He was intercepted once.
The game went sour for Oregon on its very first series. Dante Rosario's fumble was recovered by Oregon State's Brandon Hughes and the Beavers went on to score on Moore's 11-yard pass to Jason Vandiver.
Oregon tied it at 7 on Jonathan Stewart's 2-yard scoring dive with 2:19 to go in the first quarter.
Oregon State pulled back ahead with Serna's 39-yard field goal.
Leaf was intercepted by Oregon State's Derrick Doggett, who returned it 34 yards for a touchdown to put the Beavers up 17-7.
Serna just barely cleared a 50-yarder to make it 20-7.
Oregon narrowed it on Stewart's 22-yard scoring run to open the second half, but his Oregon State counterpart, Yvenson Bernard, answered with a 6-yard TD rush.
Stewart rushed for a 2-yard touchdown midway through the fourth quarter that made it 27-20. The extra point was blocked. Then Leaf found Kent in the end zone and got the two himself for an Oregon lead with 3:07 to go.
Nearly constant rain made the field slippery, and there were a few stumbles and dropped balls on both sides.
Oregon's last win at Reser Stadium was back in 1996, when the Ducks won 49-13. Oregon holds the overall lead in the series 55-45-10.
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