LAS VEGAS -- Andre Roberson was back with a vengeance.
The nation's leading rebounder scored 12 points and grabbed seven rebounds to help Colorado advance to the Pac-12 Tournament quarterfinals with a 74-68 victory over Oregon State on Wednesday at the MGM Grand Garden Arena.
Roberson missed the final two games of the regular season with a viral illness, including the fifth-seeded Buffs' 64-58 loss to the last-place Beavers in the regular-season finale at the Coors Events Center.
After Oregon State's season ended in defeat, head coach Craig Robinson was asked what the difference was from last Saturday's road victory in Boulder.
"Is that is a trick question, or did you not see Andre Roberson out there?" Robinson said.
The 6-7 junior forward was in early foul trouble but made a timely 3-pointer from the corner to give CU a 10-point lead down the stretch.
Roberson then made a pair of free throws -- banking in the first and swishing the second -- to make the score 61-49 with 2:43 remaining.
"I'm healthy," Roberson said. "It's just rustiness. I only had one day of practice and it was more of a shoot-around."
The Buffs (21-10) survive and advance to play No. 4 Arizona in the quarterfinals on Thursday at the MGM Grand Garden Arena (3:30 p.m., Pac-12 Network).
CU, the defending Pac-12 Tournament champions, is now 5-0 in this postseason party since joining the conference.
"The fact that everything is one and done gives us that urgency to go out there and play," Roberson said. "When we have a sense of urgency, we're unbeatable."
The Beavers (14-18) had the momentum and were within 38-37 after a basket by Eric Moreland, who tormented the Buffs with 17 points and 10 rebounds four days earlier. The 6-10 sophomore finished with 14 points, 13 rebounds and five blocks in the rematch.
Spencer Dinwiddie answered the challenge with a 3-pointer and then three made free throws after getting fouled on another attempt behind the arc.
Terrific ball movement against Oregon State's 2-3 zone set up a layup by Xavier Johnson that gave CU a 53-42 lead with 6:04 remaining.
"Having them come into our building and beat us on senior day, I think got these guys' attention," CU head coach Tad Boyle said. "We've got respect for Oregon State. You put their record aside and you look at their players, they've got good players. They've got talented basketball players on that team."
Joe Burton ended a 15-5 run by the Buffs with a left-handed hook shot to make it a three-possession game, and Ahmad Starks made a tough jumper to cut the Beavers' deficit to seven points.
Then Askia Booker, who was 0-for-8 from the field at the time, splashed a 3-pointer to give CU a 56-46 lead.
"The shot clock was running down at the time and the play (Boyle) ran was actually for me," Booker said. "It kind of got messed up and I caught the ball really high, but Josh (Scott) set a pretty good ball screen and gave me some space. As soon as I got some space I knocked it down."
Scott grabbed eight of his 10 rebounds in the first half and and also had seven points and two blocks before fouling out with 18 seconds left.
"I really attribute the win to Josh Scott's rebounding performance and Andre coming back," Dinwiddie said after matching counterpart Roberto Nelson, the leading scorer in Pac-12 regular-season games, with 20 points. "That was pretty much the difference."
Dinwiddie made a SportsCenter-worthy half-court shot as time expired to give the Buffs a 32-26 lead at the intermission.
The Buffs were ahead by 12 points when Oregon State started fouling with over three minutes remaining.
Starks made two spectacular 3-pointers and Moreland added another to cut Oregon State's deficit to 65-60.
"I don't think it was anything that masterful," Robinson said of the strategy. "It was what we had to do."
CU, which only shot 39.3 percent from the field and 43.8 percent from 3-point distance, closed out the game by making 15 of 21 free throws down the home stretch.
"You've got to be able to grind them out, whether it's early in March or early in November," Boyle said. "And these guys, for the most part, have done that this year."
Now it's Buffs and Wildcats, one more time.
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Colorado 74, Oregon State 68
FG FT Reb
Min M-A M-A O-T A PF PTS
Barton 20 1-4 0-0 2-2 2 4 3
Burton 23 2-6 0-0 0-2 3 2 4
Moreland 40 5-12 3-4 1-13 0 5 14
Collier 30 4-5 5-7 1-4 0 3 13
Nelson 36 6-18 6-7 2-4 2 0 20
Robbins 13 2-3 1-2 3-4 0 1 6
Starks 26 3-10 0-0 0-1 3 2 8
Schaftenaar 6 0-0 0-0 0-0 0 0 0
Reid 6 0-0 0-0 0-0 0 2 0
Totals 200 23-58 15-20 9-30 10 19 68
Percentages: FG .397, FT .750.
3-Point Goals: 7-25, .280 (Nelson 2-8, Starks 2-8, Robbins 1-2, Moreland 1-3, Barton 1-4).
Team Rebounds: 0.
Blocked Shots: 7 (Moreland 5, Reid, Collier).
Turnovers: 11 (Schaftenaar 3, Nelson 2, Collier 2, Burton, Barton, Robbins, Moreland).
Steals: 7 (Collier 3, Starks, Robbins, Nelson, Moreland).
Technical Fouls: None.
FG FT Reb
Min M-A M-A O-T A PF PTS
Booker 29 1-9 4-4 0-3 4 1 7
Johnson 33 6-10 4-9 3-8 0 1 16
Roberson 25 4-7 3-4 3-7 1 3 12
Dinwiddie 37 4-11 9-11 0-1 2 1 20
Scott 24 3-7 1-2 5-10 0 5 7
Talton 4 0-2 0-0 0-1 0 1 0
Harris-Tunks 16 1-3 0-0 3-4 0 3 2
Chen 14 0-1 2-2 0-1 4 0 2
Adams 18 3-6 0-0 1-2 1 2 8
Totals 200 22-56 23-32 17-43 12 17 74
Percentages: FG .393, FT .719.
3-Point Goals: 7-16, .438 (Dinwiddie 3-7, Adams 2-3, Roberson 1-1, Booker 1-4, Johnson 0-1).
Team Rebounds: 6.
Blocked Shots: 2 (Scott 2).
Turnovers: 11 (Roberson 5, Booker 2, Dinwiddie 2, Johnson, Scott).
Steals: 7 (Dinwiddie 2, Adams, Talton, Johnson, Chen, Booker).
Technical Fouls: None.
Oregon St. 26 42--68
Colorado 32 42--74
A -- 7,451.
Officials -- Mike Reed, Tommy Nunez, Jeff Wooten.
CU men's hoops preview
THURSDAY: The No. 5 Colorado Buffaloes (21-10) advanced to play the No. 4 Arizona Wildcats (24-6) in the quarterfinals of the Pac-12 Tournament at 3:30 p.m. at the MGM Grand Garden Arena in Las Vegas.
BROADCAST: Television on the Pac-12 Network with Kevin Calabro (play-by-play), Don MacLean (analyst) and Ashley Adamson (court side). Radio on KKZN (760 AM) with Mark Johnson (play-by-play) and Jeb Putzier (color). Follow on Twitter: @RyanThorburn.
CU STORY LINES: It's the rubber match for Buffs against a team CU fans like to say Colorado beat twice this year. Colorado lost the conference opener in Tucson in OT, 92-83, when Sabatino Chen's 3-pointer at the buzzer was waved off, then came back to take a 71-58 win in Boulder. ... Even the Colorado players say they like to think they are 2-0 against the Wildcats. "We don't go back and cry over spilled milk ... but we do feel like we're 2-0 against them," said Buff Spencer Dinwiddie. ... It's the second straight year the Buffs won their opener in the Pac-12 tourney. A year ago, they won four games in four days to win the title and earn an NCAA berth.
ARIZONA STORY LINES: Wildcats are ranked 18th in the nation, but are just the No. 4 seed in the tourney. ... The Wildcats finished the season losing two of their last three, falling at USC and UCLA before beating Arizona State at home in the regular season finale. ... Thursday's game is also a rematch of last year's Pac-12 Tournament title game, which Colorado won 53-51. That win sent the Buffs to the NCAA Tournament and left Arizona on the outside looking in.
KEY STAT: In the overtime loss in Arizona, the Buffs lost the rebound battle 44-33. In CU's win in Boulder, it was virtually even, with Arizona holding a slim 31-30 edge on the boards.
COACHES: Boyle is 68-36 in his third season at CU. Sean Miller is 93-41 in his fourth season at Arizona.
SERIES: Colorado leads the all-time series 11-7, including a 2-1 edge on neutral courts.
PROBABLE STARTERS: Colorado -- F Andre Roberson, 6-7, Jr., 10.8 ppg, 11.5 rpg; F Xavier Johnson, 6-6, Fr., 8.7 ppg, 4.8 rpg; F Josh Scott, 6-10, Fr., 10.7 ppg, 5.4 rpg; G Spencer Dinwiddie, 6-6, So., 15.4 ppg, 3.0 apg; G Askia Booker, 6-1, So., 12.6 ppg, 2.2 apg. Arizona -- F Kevin Parrom, 6-6, Sr., 8.7 ppg, 5.0 rpg; F Solomon Hill, 6-7, Sr., 13.6 ppg, 5.2 rpg; C Kaleb Tarczewski, 7-0, Fr., 6.6 ppg, 5.9 rpg; G Mark Lyons, 6-1, Sr., 14.9 ppg, 3.0 apg; G Nick Johnson, 6-3, So., 11.6 ppg, 3.1 apg.
UP NEXT: If the Buffs win they will play the winner of the No. 1 UCLA/No. 9 Arizona State game in the semifinals on Friday night at the MGM Grand Garden Arena (7 p.m., Pac-12 Network).