HOUSTON — The No. 13 Oklahoma State Cowboys have been known more for their offense than their defense.
The Cowboys' defense, however, kept Oklahoma State in the game long enough for their offense to wake up Saturday against the Mississippi State Bulldogs.
J.W. Walsh threw for 135 yards and ran for another 125 and a touchdown to lead Oklahoma State to a 21-3 win over Mississippi State in the Texas Kickoff.
Walsh finished 18 of 27 after relieving starter Clint Chelf on the Cowboys' third series.
Oklahoma State head coach Mike Gundy said Walsh would be the starter at UT-San Antonio next week.
"It was exciting to get in the first game of the year that we have been waiting all year for," Walsh said. "It was a lot of fun and exciting. There were some tough moments at the beginning, but once we got in our stride, we were good."
Jeremy Smith rushed for 102 yards and two touchdowns on 15 carries for Oklahoma State (1-0), which piled up 432 yards on offense after struggling for most of the first half.
"We wanted to be more physical than they were in the running game," Gundy said. "Early, we were very poor at that, but as the game wore on, we felt like we became more physical than they were on both sides of the ball running it and defending the run, so we stayed with that and allowed J.W to stay with that when he came in. He gave us a little bit of a spark."
Tyler Russell finished 10 of 16 for 133 yards before being helped off the field and taken to the locker room in the third quarter after being brought down on a scramble. Dak Prescott replaced Russell, throwing for 89 yards on seven of 17 passing.
Mississippi State head coach Dan Mullen would not specify what injury Russell had, but said the quarterback would be looked at again.