No. 18 Oklahoma St. upsets No. 15 Texas Tech 52-34

LUBBOCK, Texas -- No. 18 Oklahoma State Cowboys drew first blood and showed staying power all the way to a 52-34 upset of the No. 15 ranked Texas Tech Red Raiders.

The Cowboys gained a 21-0 lead 11 minutes into the first quarter and, though the Red Raiders cut it to as little as four, Oklahoma State did what it needed to ride out of Lubbock with a victory.

Oklahoma State continued its dominance of Texas Tech, which goes back to Mike Leach's final season leading the Red Raiders. The Cowboys (7-1, 4-1 Big 12) have won five straight against Texas Tech, the first program to do that in a series that dates back to 1935.

"We've been playing good the last few games," Oklahoma State safety Daytawion Lowe said. "But we have a tough road ahead of us."

Texas Tech first-year coach Kliff Kingsbury used signs reading "98" posted around the Red Raiders' facilities leading up to the game against the Cowboys, the number signifying the number of points Oklahoma State has beaten the Red Raiders by the last two seasons.

But Texas Tech (7-2, 4-2), which peaked as high as No. 10 in the BCS standings, lost for the second straight week and the Cowboys continued the trend of pummeling the Red Raiders.

Oklahoma State defeated Texas Tech by an average margin of 39 points the last three seasons.

This time the margin wasn't quite as big, partially because Oklahoma State quarterback Clint Chelf threw a pair of costly interceptions, but Chelf also made plenty of plays with his arm and legs.

"He had a glaring mistake," Oklahoma State coach Mike Gundy said. "But for the most part he made some big plays to help our team."

Chelf passed for 211 yards and two touchdowns, and rushed for 88 yards and two scores. His 67-yard touchdown run midway through the third quarter gave the Cowboys an 18-point lead.

Texas Tech kept coming, but the Red Raiders couldn't stop Oklahoma State's offense enough to gain much traction for a comeback.

Oklahoma State took control midway through the first quarter with 21 straight points that left the crowd at Texas Tech stunned.

Chelf was on target when he needed to be, hitting all three passes on an 84-yard touchdown drive, which he capped with a six-yard touchdown pass to Tracy Moore.

The Cowboys then took advantage of a fumble recovery and a blocked punt on the Red Raiders' next two possessions.

Cowboys backup fullback Derek Branson slipped through the Texas Tech punt team and blocked punter Ryan Erxleben's kick. Branson then recovered the bouncing ball and returned it to the Texas Tech 15.

"The blocked punt, we came up with a plan and it worked," Gundy said. "And the turnovers came from effort. If your team is around the ball, you're going to get some turnovers."

It took Oklahoma State just four plays to score as Roland notched a one-yard touchdown to put the Cowboys ahead 21-0.

The Red Raiders attempted to punch back, scoring 10 straight points on a Ryan Bustin 32-yard field goal and Davis Webb's 38-yard touchdown pass to Eric Ward.

After Oklahoma State stalled the momentum with a long touchdown drive and an interception, Texas Tech's defense came up with its first big play of the game.

Red Raiders linebacker Pete Robertson intercepted a pass and returned it 21 yards for a touchdown to cut the Cowboys lead to 28-17.

"I just put the ball down when I scored," Robertson said. "I was ready to go and get back out there. We were down and we needed to keep playing."

Texas Tech came up with a three-and-out and Davis Webb went back to work for the Red Raiders. Webb hit 3-of-3 passes, including a 28-yarder to Jakeem Grant, to move Texas Tech inside the Cowboys' 10.

Kenny Williams ran two yards for the touchdown as Texas Tech sliced an 18-point lead to 28-24 at halftime.

Josh Steward helped Oklahoma State rebuild its lead by returning a punt 46 yards to the Texas Tech 11. Desmond Roland ran four straight times from there, including a three-yard touchdown to put the Cowboys ahead 35-24.

Oklahoma State forced Texas Tech to go three-and-out, setting up Chelf's 67-yard touchdown, putting the Cowboys ahead 42-24 with 7:50 left in the third quarter. Texas Tech failed to get closer than 11 the rest of the way.

NOTES: Oklahoma State coach Mike Gundy and Texas Tech coach Kliff Kingsbury are two of 12 coaches in FBS coaching at their alma mater and the only two in the Big 12. Both are former quarterbacks. ... Oklahoma State extended its streak to 30 consecutive games with a touchdown drive of faster than two minutes when the Cowboys went 45 yards in three plays, clocking in at 37 seconds for a first-quarter touchdown that gave Oklahoma State a 14-0 lead. ... Oklahoma State averaged 45.7 points in its four-game winning streak against Texas Tech entering Saturday's game. ... Texas Tech last defeated then No. 8-ranked Oklahoma State in 2008 when Texas Tech 56-20 in Lubbock. ... Texas Tech went 1-7 in the month of November the last two seasons including a pair of losses against Oklahoma State.