Ames, Iowa Oklahoma backed off Jamaal Tinsley and Tinsley made the Sooners pay.
Tinsley hit three quick three-pointers to spark a torrid second half, and Kantrail Horton scored a career-high 27 points as No. 23 Iowa State beat No. 15 Oklahoma, 100-80, Saturday in a Big 12 opener.
Known more for his passing than shooting, Tinsley finished with a career-high five three-pointers in seven attempts.
"Our game plan was to get off him a little bit and give him the jump shot," Oklahoma's Hollis Price said. "But he came out in the second half and showed us he can hit the three-pointer and then we had to respect him. He just created off that."
Tinsley, who woke up feeling sick, had been 8-for-27 on three-pointers coming in. He finished with 17 points, eight assists and three steals.
Iowa State (13-1), the defending Big 12 champion, went from a 14-point deficit late in the first half to 12 points ahead in the first 7:20 of the second half en route to its 29th straight home-court victory.
The Cyclones shot 61 percent in the second half and scored 100 points in a conference game for the first time since 1995.
OU (11-2) shot 64 percent in the first half but went more than five minutes without a basket at the start of the second half and lost a conference opener for the first time in coach Kelvin Sampson's seven seasons.
Freshman Jake Sullivan added 17 points for Iowa State, Paul Shirley scored 15 and reserve Richard Evans had a career-high 14. Horton, whose previous best was 21 points, grabbed 11 rebounds to lead Iowa State's 39-21 edge on the boards and ISU finished 12-for-18 on three-pointers.
No. 24 Texas 78, Oklahoma State 71
Austin, Texas Maurice Evans scored 18 points and Brian Boddicker added 17 as Texas ran its home winning streak to 21 games. The Cowboys (8-3, 0-1) haven't won in Austin since 1974. Maurice Baker scored 26 points for Oklahoma State.
Baylor 61, Colorado 56
Waco, Texas DeMarcus Minor hit four free throws in the final 37 seconds, extending his Big 12 record to 46 in a row, as Baylor (12-0, 1-0 Big 12) remained undefeated. Minor's last two free throws came after Colorado (10-4, 0-1) missed a game-tying shot. Terry Black led Baylor with 19 points, including seven in a game-opening 12-0 run. Chad Elsey had 15 points and Minor had 10. Michel Morandais had 14 off the bench to lead Colorado. Jamahl Mosely and D.J. Harrison both had 10 points.
Kansas State 53,
Texas A&M 48
College Station, Texas Kansas State took advantage of 29 percent shooting by Texas A&M to notch just its second road win of the season. K-State (7-5, 1-0 Big 12) has won five of its last six games, while the Aggies (6-7, 0-1) had a three-game winning streak snapped. Quentin Buchanan scored 19 points for KSU, while Travis Davis added 12 off the bench and Kelvin Howell grabbed 15 rebounds. Bernard King led A&M with 17 points and was the only Aggie starter to score more than five points.
Columbia, Mo. Kareem Rush scored 30 points and hit two clinching free throws as Missouri (10-3) rallied from a 10-point deficit to beat Nebraska. Clarence Gilbert and Arthur Johnson finished with 16 and 13 points, respectively, for MU. Kimani Ffriend had 15 points and 11 rebounds for Nebraska (7-7), which has lost four in a row. Cary Cochran added 15 points for the Huskers, who were slowed by 24 turnovers.