Brock Purdy threw two touchdown passes, Breece Hall rushed for two scores and No. 24 Iowa State's defense put the clamps on Texas Tech's potent offense in a 31-15 victory at Ames, Iowa, on Saturday.

Iowa State, 3-1 overall, is 3-0 in the Big 12 for the first time since 2002.

Texas Tech (1-3, 0-3) entered the game averaging 512 yards, ranking ninth in the nation, but mustered only 270 against the Cyclones.

The Big 12's leading receiver, KeSean Carter (21 receptions, 215 yards), did not play for the Red Raiders because of an ankle injury.

Purdy completed 32 of 43 pass attempts for 302 yards. He did not have an interception. He spread his completions to 11 different receivers, led by Xavier Hutchinson's nine receptions for 77 yards.

Hall, the leading rusher in the Big 12 coming into Saturday, gained 135 yards on 27 carries.

Iowa State responded after Texas Tech opened the scoring with a 90-yard blocked field goal return by Zech McPhearson with 8:00 left in the first quarter. Eli Howard got a hand on the 20-yard attempt by Connor Assalley.

The Cyclones had touchdowns on their next three possessions to take a 21-7 lead at halftime. Hall rushed for two of the scores and Purdy completed a 2-yard touchdown pass to Chase Allen.

By halftime, Hall had 108 yards on 19 carries and Purdy completed 19 of 25 passes for 187 yards.

Texas Tech had only 69 yards in total offense at halftime. It boasted a 100-yard rusher in the first three games but its leading rusher at halftime, Xavier White, had only 12 yards on four carries.

White finished with a team-high 21 yards on seven carries.

Purdy's 13-yard touchdown pass to tight end Charlie Kolar with 3:06 remaining in the third quarter gave Iowa State a 28-7 lead. Assalley added a 26-yard field goal with 12:07 left in the fourth quarter.

Texas Tech quarterback Alan Bowman completed 13 of 22 pass attempts for 97 yards before being replaced by Henry Colombi in the fourth quarter. In his first drive, Colombi completed 6 of 8 passes for 63 yards, including an 18-yard touchdown pass to Erik Ezukanma with 5:00 left.

--Field Level Media