EUGENE, Ore. – On a night of college football chaos, Jordan Williamson kicked a 37-yard field goal in overtime and No. 14 Stanford upset No. 1 Oregon 17-14 on Saturday, denying the Ducks a chance to clinch the Pacific-12 Conference North and derailing their straight shot to the BCS title game.

If Stanford and Oregon win their final games next weekend, both will finish with one conference loss, which means Stanford will win the head-to-head matchup and go to the Pac-12 championship game for a chance to play in the Rose Bowl.

After winning its fifth straight, Stanford (9-2, 7-1 Pac-12) will play its finale at No. 17 UCLA, which defeated No. 21 USC 38-28 earlier in the day to claim the Pac-12 South. Oregon (10-1, 7-1) will play Oregon State in the annual Civil War rivalry game in Corvallis.

The loss snapped a 13-game winning streak for the Ducks, which was the longest in the nation going into Saturday.

"It hurts, and as I told them, you'd like to have some words that would take the pain out of it, but there aren't," Oregon coach Chip Kelly said. "We'll feel bad for a little bit of time, and we'll bounce back from it."

Oregon's loss, coupled with No. 2 Kansas State's – they were also the top two teams in the BCS standings – means third-ranked Notre Dame is now the lone unbeaten team in the race for the BCS title game. The Fighting Irish control their national championship run with No. 4 Alabama and a couple of other Southeastern Conference teams also in the thick of it.

Oregon was the only Pac-12 team that Stanford hadn't defeated over the past two seasons. But the Cardinal's tough defense smothered the highest scoring team in the nation.

Alejandro Maldonado missed a 41-yard field goal for the Ducks to open overtime before Williamson's winner.

Redshirt freshman Kevin Hogan threw for 211 yards and a game-tying fourth-quarter touchdown for Stanford, while Stepfan Taylor rushed for 161 yards on 33 carries.

Down 14-7, Stanford went for it on fourth and 1 on the Oregon 12 with 2:17 left in regulation and Ryan Hewitt ran two yards for the first down. Hogan hit Zach Ertz with a 10-yard scoring pass to tie it at 14 with 1:35 to go. Ertz fought to gain control of the ball with a defender as he fell to the turf on top of a Ducks player. The play was ruled incomplete, but a video review overturned it for the tying score.

Despite a pass interference call that gave them a crucial first down, the Ducks were forced to punt on the ensuing series. Stanford took over with 36 seconds to go, and the game went to overtime.

Oregon's top rusher was quarterback Marcus Mariota, who ran for 89 yards. Mariota, a redshirt freshman who had been getting Heisman buzz, threw for 207 yards and a TD.

Stanford stuffed what seemed a sure first-quarter Oregon scoring drive when Mariota took off on a 77-yard keeper to the Stanford 15. But the Ducks couldn't get much closer, and Stanford got the stop when Oregon went for it on fourth and two on the 7.

Stanford scored first on Hogan's one-yard plow into the end zone early in the second quarter. Oregon tried again on fourth and four midway through the quarter but was unsuccessful, this time when Mariota's pass to tight end Colt Lyerla was incomplete.

When Oregon took over on downs from Stanford on the next series, the Ducks marched 59 yards in three plays – capped by Mariota's 28-yard touchdown pass to Keanon Lowe – to tie it at 7.

Oregon went ahead 14-7 on De'Anthony Thomas' six-yard run in the third quarter but missed a chance when Maldonado's 42-yard field goal attempt went wide right. Williamson missed a 43-yard field goal try for Stanford early in the fourth quarter.

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