BOULDER, Colo. (AP) _ Gen. Patton's boot-camp practices paid off.

Colorado coach Ricardo Patton put his team through three-hour practices this week, as well as closing the workouts and banning media interviews.

Focused intently on No. 17 Oklahoma and without any distractions, the Buffaloes upset the Sooners 88-80 Wednesday night.

"Our team has been practicing very hard," Patton said. "We went three hours on Monday. We've been going 2 1/2 to 3 hours at a high level of intensity. Jamahl Mosley said practice was harder than the game tonight. The games are only 40 minutes."

Jaquay Walls scored 19 of his 28 points in the second half for the Buffaloes, who snapped an 11-game losing streak to Oklahoma and who had lost 37 of their previous 39 games to the Sooners.

Colorado (10-6, 1-3 Big 12) outshot the Sooners 55 percent to 47 percent and made critical free throws down the stretch after Oklahoma (14-3, 2-2) fell behind by 12 points with 8:21 left and was forced to foul.

Walls had 17 points over the final 10:42, including 13 of 14 free throws.

Mosley added 19 points and Will Smith had 15 for the Buffs.

"We moved the ball well tonight, and everybody was getting open looks," Walls said. "This was not a statement game. We just have to keep it going. This win doesn't mean anything if we lose this Saturday (to Kansas State). Consistency is key."

Patton said the victory was "a byproduct of how we played. We just stepped it up and played like men. If we continue to play like that, we'll be OK."

Eduardo Najera had 17 points and 14 rebounds for Oklahoma. Freshman guard Hollis Price, who fouled out late in the game, scored 15 points for the Sooners and Tim Heskett had 14. The loss was the second in a row for the Sooners, both on the road.

"I heard our crowd chanting `Overrated, overrated,"' Patton said. "That team is not overrated. We've just been underachieving. This shows you how tough it is to play two straight road games in the Big 12. Just as Oklahoma learned tonight, unless you are a much more talented team, it is tough to win on the road."

Sooners coach Kelvin Sampson was disappointed in his defense, which came into the game ranked first in the conference, yielding only 60.2 points per game.

"When we get a 10-point lead (in the first half), that's when your defense needs to kick in," Sampson said. "It's been a long time since I've seen us give up shots like that.

"Colorado played really well. They played with a purpose. They're quick and athletic. It still comes down to defense, and we couldn't stop them from scoring."

Oklahoma, which trailed 44-38 at halftime, mounted a 7-0 run early in the second half and got within two points, but could get no closer.

Richard Fox's layup, Walls' two free throws and Smith's free throw gave Colorado its biggest lead, 68-56.

Price and Heskett hit 3-pointers as the Sooners cut the deficit to 70-66 with 4:48 left, but Walls countered with a 3-pointer from the corner and a running bank shot for a 75-66 lead with 3:28 to go.

Oklahoma's Kelly Newton hit two 3-pointers, but Colorado went 11-of-12 from the line over the final 1:19.

Colorado outscored Oklahoma 26-11 over the last 12 minutes of the first half to take its six-point halftime lead.

Oklahoma jumped ahead early with four straight 3-pointers, including three by Heskett, during a 12-2 run that produced a 27-18 lead with 12:07 left in the half.

But Colorado then made eight consecutive baskets, including two by Mosley and capped by two from Smith. That spurt highlighted an 18-8 run that gave Colorado a 36-35 lead.

After Najera's 3-pointer with 9:00 left in the half, the Sooners made only two field goals the rest of the half.

Mosley had 15 points on 7-of-8 shooting in the half as the Buffaloes shot 58 percent compared to the Sooners' 48 percent. Najera led the Sooners with 13 points and six rebounds.

With 13:13 left in the game, Colorado's Aki Thomas was whistled for a flagrant foul for elbowing Najera and was ejected.

Patton said the incident had no obvious effect on his team's emotions.

Sampson said the "incident was totally uncalled for. There is no excuse for that. He should be suspended."