EUGENE, Ore. (AP) - The offense turned the ball over late and the defense couldn't get a stop in the final minutes.
With the game on the line, No. 19 Oregon wilted as Colorado rallied to upset the Ducks 48-47, despite not leading until the final basket.
Andre Roberson scored off his own miss with 29 seconds left and Colorado recorded the final eight points of the game.
``Disappointing,'' Oregon coach Dana Altman said with a shake of his head.
Carlos Emory and E.J. Singler scored 14 points to lead the Ducks (18-5, 7-3 Pac-12), whose third consecutive loss snapped a 20-game home winning streak.
Singler had a chance to win it for Oregon but his long jumper was tipped by Spencer Dinwiddie and fell into Roberson's hands under the basket with 1.1 seconds left.
``The final play was designed for me to get a drive, but they played really good defense and blocked,'' Singler said. ``After that I just tried to get a good shot.''
Arsalan Kazemi also had 11 rebounds and six points for the reeling Ducks, who are 1-3 without starting point guard Dominic Artis, who missed his fourth straight game with an undisclosed foot injury.
``Dominic spreads the floor,'' Altman said. ``The floor has shrunk and it's been hard to drive to the hoop.''
Roberson finished with 10 points and 13 rebounds for the Buffaloes (15-7, 5-5), who trailed 47-40 with just under four minutes to play when they rallied for their lowest scoring victory of the season.
``We're just trying to get back on track, trying to get where we want to be,'' Roberson said. ``This was one step forward.''
``Huge win'' said Colorado coach Tad Boyle, whose team was coming off a 58-56 loss to lowly Utah, the Buffaloes' only blemish in their last five games. ``That was a head-scratcher. But when we're dialed in, we're pretty good.''
They were certainly that against Oregon late in the game.
The Ducks led 28-23 at halftime and never trailed until Roberson's last basket on a possession that was set up by Oregon's fourth straight turnover, an offensive foul called on Singler at the other end.
Roberson took a pass from Dinwiddie under the basket but had his first attempt blocked from behind by Kazemi.
```Go get it, go get it,''' Roberson said he told himself. ```If you want to win this game, put it all on the line.'''
He got it, and went back up for the basket.
``Andre can get it to the rim awfully quick,'' Boyle said.
Colorado had 17 second-chance points altogether, including two more by Roberson with 2:12 to play that made it 47-46.
Dinwiddie scored seven of the Buffaloes' first 10 points in the second half as they cut their halftime deficit to 35-33 with 14:19 to play.
Ben Carter answered for Oregon with a jumper from the baseline and Emory followed with a pair of free throws - the Ducks' first trip to the foul line in the game - to extend the lead to 39-33 with 11:02 to go.
Oregon's lead grew to 47-40 on a dunk by Emory with 4:26 to play. But those were the Ducks' final points as they went 0 for 3 from the field the rest of the way.
``I definitely sensed a little panic when we started making a little comeback,'' Roberson said. ``You could definitely sense they were feeling pressure to score the ball.''
Oregon shot just 36.2 percent from the field and had seven of its 12 turnovers in the final 7:39.
Colorado also had 12 turnovers and shot just 36.5 percent, but the Buffaloes got hot at the end of the game, going 3 for 5 from the field in the final four minutes.
``I'm more disappointed with our defense than our offense,'' Altman said. ``We didn't get stops and gave up too many second-chance points.''
The Ducks broke an early tie with a 10-2 run to take a 15-7 lead by the 10:58 mark of the first. Emory had four points during that stretch, while Colorado's only points came off a monster two-handed slam of a rebound by Roberson over Kazemi.
Kazemi got his revenge on the Ducks' ensuing possession, spinning to the basket for a one-handed dunk off a rebound. The typically subdued Kazemi then flexed his biceps as the Oregon student section erupted.
Trailing 17-11, the Buffaloes got back-to-back 3-pointers from Jeremy Adams and Askia Booker to tie the score with 5:47 to play in the half.
But Colorado cooled off, making just one of its next seven attempts from the field as the Ducks went up 26-19 with 2:19 to play on a 3-pointer by Singler, who had 12 points in the first half.

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