JT Toppin produced 26 points and 10 rebounds as No. 9 Texas Tech did just enough to hold on for a 76-74 win over Baylor in the quarterfinals of the Big 12 Conference tournament on Thursday in Kansas City, Mo.The Red Raiders (25-7) missed their final 10 shots from the floor and 13 of their last 14, going the final 7:26 without a field goal. Texas Tech shot just 19.4 percent from the floor after halftime, leaving the door open for seventh-seeded Baylor (19-14).Texas Tech missed two free throws with 5.8 seconds remaining, but Baylor’s VJ Edgecombe had his running 3-point attempt at the buzzer clang off the rim and away. As a result, the Red Raiders earned a semifinal matchup with Arizona.Darrion Williams added 14 points for Texas Tech. Norchad Omier paced Baylor with 29 points and 15 boards, and Edgecombe scored 11 points.No. 2 Houston 77, Colorado 68Emanuel Sharp had 19 points, Milos Uzan and LJ Cryer each added 14, and the top-seeded Cougars advanced to the Friday semifinals with the win over the 16th-seeded Buffaloes.Joseph Tugler scored 10 points for Houston (28-4), which will face fourth-seeded BYU in the semis.Andrej Jakimovski led Colorado (14-20) with 25 points and eight rebounds, while Bangot Dak contributed 10 points.No. 17 BYU 96, No. 12 Iowa State 92Richie Saunders recorded 23 points and five assists and Fousseyni Traore added 15 points to help the Cougars beat the Cyclones to reach the semifinals of the Big 12 tournament.