BOULDER, Colo. (AP) -- Jeff Boschee has a simple, blunt attitude about 3-pointers:

"They're backbreakers," Kansas' sophomore guard said. "They drain the defense mentally."

	Nick Bradford was one of five Jayhawks to score in double-figures on Saturday night.

Boschee did just that to Colorado on Saturday night, hitting three key 3-pointers in the second half, when he scored all 13 of his points in the No. 9 Jayhawks' 84-69 come-from-behind victory.

In the Big 12 opener for both teams, the Jayhawks (12-2) overcame an eight-point deficit early in the second half, outscoring Colorado 18-4 over a six-minute span and then 23-3 late in the game to clinch it.

Kenny Gregory also had 13 points for Kansas, which beat Colorado for the 21st straight time. Nick Bradford and Eric Chenowith had 11 points each and freshman Drew Gooden had 10.

Colorado (9-4) was led by Jamahl Mosley and Kyle Williams, each with 16 points. Nick Mohr added 14.

Kansas shot only 31 percent in the first half but 59 percent in the second half to finish at 43 percent. Colorado shot just 27 percent (18-of-67), including 25 percent in the second half.

"They were more aggressive than us in the first half," Kansas coach Roy Williams said. "I challenged our kids at the half. I talked to them about being down and that we hadn't been down at the half yet this year and come back.

"We had a lot of good play from a lot of people in the second half. We started moving the ball better. Boschee hit some 3s. We played the same zone defense we did in the first half, we just did a better job of it."

Boschee said he and his teammates were "just standing around in the first half. We just didn't compete. Coach challenged us. We came out with more heart and more character in the second half. The difference was our execution on offense. We showed more patience and we knocked down our shots."

One of Kansas' primary defensive goals was to stop Colorado guard Jaquay Walls, who scored 23 and 22 points against the Jayhawks in their two meetings last year.

"Our perimeter people know how good he is," Williams said. "We just wanted to throw a lot of people at him, and we tried to give him different looks."

Walls, drawing a crowd every time he touched the ball, went 0-for-9 from the floor, finishing with nine points.

"That's why they're the No. 9 team in the country," Colorado coach Ricardo Patton said. "They expose every weakness you have.

"We came out in the second half and hit a couple of good shots, but then Jaquay Walls goes 0-for-9, Nick Mohr goes 4-for-14 and Richard Fox goes 1-for-10. If you can't put the ball in the hole, you can't win."

Kansas, which has won nine straight conference openers, trailed 39-35 at intermission and was down by eight when Mosley hit two baskets in the first 44 seconds of the second half.

But Boschee's 3-pointer capped a 7-0 run that cut the deficit to 43-42. After a rebound layup by Colorado's Richard Fox, Gooden hit a rebound layup of his own and Boschee another 3-pointer for a 47-45 lead with 15:16 left in the half. The Jayhawks did not trail again.

Boschee's short jumper, Chenowith's 12-footer and Nick Collison's bank shot made it 65-57.

Boschee, who was 0-for-5 in his scoreless first half, had a 3-pointer and a fastbreak layup to highlight the Jayhawks' 13 straight points that finished off the 23-3 run and produced an 82-60 lead with 2:21 left.

Bradford's two slams keyed an 8-0 run in the first half, giving Kansas a four-point lead. The Buffaloes countered with their own 8-0 flurry later in the half, including two 3-pointers by Mohr, to make it 35-31.