STILLWATER, Oklahoma (Ticker) -- Bill Self's homecoming was not a pleasant one.
John Lucas scored 21 points as No. 10 Oklahoma State jumped out to a big early lead and coasted to an 80-60 rout of No. 13 Kansas that put the Cowboys into first place in the Big 12 Conference.
The game marked a trip home for Self, the first-year Kansas coach who played for the Cowboys from 1982 to 1985. A native of Edmond, Oklahoma, Self was an assistant at OSU from 1987 to 1993, where he worked under current mentor Eddie Sutton.
Self received a warm ovation and then watched his team fall behind by 18 points less than 7 1/2 minutes into the game.
"It felt good for about 2 1/2 minutes. I thought that the crowd was awesome," Self said. "I hate to say (the slow start) was the ballgame, but that is what it turned out to be. Regardless of how well they played early, and Oklahoma State threw in some shots, we were really bad."
The game was one of the biggest at Gallagher-Iba Arena in recent memory, attracting an overflow crowd and past Cowboys stars including Bryant Reeves.
The current group of Cowboys (18-2, 8-1 Big 12) rose to the occasion, jumping to a 44-26 halftime lead behind Lucas, who had 14 points before intermission. Lucas, a Baylor transfer who is the son of former NBA player and coach John Lucas, made 7-of-9 shots from the floor.
"The sky is the limit for the this team," said Lucas, who overcame six turnovers. "We have a lot of talent on this team. Our motto is that once we get a team down we make sure they stay down."
Oklahoma State, in search of its first Big 12 championship, extended its winning streak to eight games and improved to 11-0 at home this season.
The Jayhawks (15-5, 7-2) were on the opposite side of a lopsided score after routing Texas Tech, 96-77, on Saturday and were held to their lowest point total of the season.
Wayne Simien scored 25 points and J.R. Giddens had 12, but no other Jayhawk reached double figures. Giddens made 5-of-14 shots from 3-point range and the rest of the team was a combined 1-for-8.
"The way we played is a good example of how (Self) doesn't want us to play," Simien said. "Relying on our offense too much, not getting stops, guys not competing out there - these are things we can't have."
All five Cowboy starters scored in double figures with Tony Allen collecting 17, Ivan McFarlin 12, Daniel Bobik 11 and Joey Graham 10.
"We need to keep it going. We're not going to stop here," McFarlin said.
With a frenzied crowd behind them, the Cowboys jumped out to a 26-8 lead with 12:49 left in the first half. Lucas had 10 points in the opening spurt, including a pair of 3-pointers. Allen also hit back-to-back 3-pointers during the spurt.
Any chance of a second-half comeback ended quickly when McFarlin scored on a layup and Lucan drained a 3-pointer in the first 43 seconds to make it 49-26. The Jayhawks got no closer than 16 points the rest of the way.