LAWRENCE, Kan. (AP) -- Kansas paid homage to its 110-year-old basketball heritage Saturday by stretching its home winning streak against Colorado to a quarter of a century.
With more than 200 former coaches and players looking on, and current players and cheerleaders wearing retro uniforms, the third-ranked Jayhawks ran away in the second half to a 69-45 victory over the Buffaloes.
Colorado star Richard Roby, who had 30 points in Allen Fieldhouse last season, was the primary victim of a fierce defensive effort, going 1-for-11 from the field as Kansas (24-2, 9-2 Big 12) beat Colorado at home for the 25th straight year.
Roby had only two points and the Buffaloes (10-14, 2-8) shot 35 percent.
"We muddied up their stuff pretty good today. Really good," Kansas coach Bill Self said. "We did a great job of taking away backdoors and played to the scouting report about as well as we have all year."
At halftime, the sellout crowd of more than 16,000 came to its feet and remained standing as the former coaches, players and trainers filed onto the court. An invitation-only dinner was planned for Saturday night, but several of the old-timers, including former coach Larry Brown, had been visiting with the players in practice the past couple of days.
Brown, who coached Kansas' 1988 national championship team and is the only man to coach teams to both NCAA and NBA titles, had made the players so nervous that Self became concerned.
"We threw it all over the gym," said Self, who was given his first job in coaching as a graduate assistant to Brown at Kansas in 1985. "I asked them, 'What's wrong? You nervous because he's here?' And every one of them raised their hand.
"It meant a lot for our players to have not only him, but everybody else back. We talked a lot about what was going on and how cool this is."
Mario Chalmers had 13 points for Kansas and Darnell Jackson added 12 as the Jayhawks solidified their slim lead in the Big 12 by scoring 23 points off turnovers and outrebounding the overmatched visitors 38-24.
Marcus Hall had 15 points for Colorado.
Roby, the 6-foot-6 senior who had averaged 18 points in three games at Allen Fieldhouse, was guarded mostly by Darrell Arthur and missed his first seven shots. The Buffs' leading scorer the past three seasons, Roby is 0-8 against Kansas and his teams have lost in Lawrence by 23, 21, 29 and 24 points.
"It was just one of those nights," said Roby, who had one point in Colorado's season opener and failed to score in double figures for only the third time this season.
"The ball just did not want to go in. You go through that as a basketball player, but it is all about how you bounce back. I've been in this situation before, so I know what I have to do to get back on track."
It was one of the few times in his career that the 6-foot-9 Arthur guarded a perimeter player.
"We've been playing a lot of small guys lately and it was kind of tough guarding him and learning the principles of guarding a perimeter player," Arthur said. "We did a good job on him."
Kansas led 32-20 at halftime and put the game away with a 13-0 run in the second half. Brandon Rush, playing his third game without the heavy knee brace he wore after ACL surgery, got the run started and brought a big laugh from the crowd when he lunged for an offensive rebound and lost control of the ball only to have it crash off the backboard and through the net.
"We didn't do anything that you're supposed to do if you want to win a basketball game," Colorado coach Jeff Bzdelik said. "We didn't defend, we didn't rebound, we didn't pass the ball and we didn't cut hard. Plain and simple, we're disappointed."
After Rush's lucky basket, Sasha Kaun hit a one-handed layup and Chalmers canned a 3-pointer before Roby was called for his third foul and went to the bench.
Sherron Collins' alley-oop pass led to a dunk by Arthur and a 46-24 lead. A few minutes later, Kaun's one-hander off the glass made it 50-24.
The Jayhawks, who had been only 4-of-26 from 3-point range in their previous two games, improved to 8-for-19 against the Buffaloes, who have lost 32 straight to ranked teams on the road.
The victory assured Kansas of being the only Big 12 school to have a winning league record every season since the conference was formed 12 years ago.
Chalmers said the Jayhawks enjoyed playing in front of all the former coaches and players.
"It was great for us to go out there and be a part of it all," he said. "There's a lot of tradition here and now we have a chance to be a part of something great. Hopefully, we can add to that tradition as a team."