Michael G. Seamans, Associated Press
Houston safety Kenneth Fontenette (28) stands in the end zone as Colorado State's Dion Morton and Eric Peitz celebrate after a T.D.

LAS VEGAS — Omar Clayton threw a 25-yard touchdown pass to Phillip Payne on the Rebels' first play of overtime to beat Iowa State 34-31 on Saturday night.

Iowa State (2-2), which lost its 13th straight road game, scored first in overtime on a 37-yard field by Grant Mahoney for the Cyclones' first lead.

The Rebels needed just one more play to win it.

Clayton, who finished with three touchdown passes and one touchdown run, threw a perfect fad pass to Payne in the corner of the end zone. The same play helped the Rebels force overtime last week in their 23-20 upset of Arizona State.

UNLV (3-1) surrendered a 21-point, second-half lead as Iowa State quarterback Austen Arnaud accounted for four touchdowns. The last was a 28-yard scoring strike to R.J. Sumrall with 3 seconds to play to force overtime.

The victory was UNLV's third of the season, which surpasses its win total of two in each of the past four seasons.

COLORADO STATE 28, HOUSTON 25: At Fort Collins, Colo., the play appeared to be a mismatch: Colorado State's 6-foot free safety Klint Kubiak going for the football in the end zone against Houston's 6-foot-3-inch receiver L.J. Castile with the game on the line.

No contest.

Kubiak out-jumped Castile and intercepted the ball in the final eight seconds to help Colorado State (2-1) hold on for a 28-25 win Saturday.

"I got off the ground about one inch and I thought, 'Oh, no,"' said Kubiak, whose father, Gary, coaches the Houston Texans. "It seemed like it was hanging in the air forever, but it hit my hands and I got the ball."

Billy Farris threw for 276 yards and two touchdowns and Kubiak made the game-saving interception to hold off Houston (1-3).

Farris was 24-for-33 throwing, without an interception. Dion Morton caught five passes for 126 yards and a score for Colorado State.

Case Keenum finished 37-for-54 passing with three touchdown passes and three interceptions. The last pick ended the Cougars' drive to overcome a 21-point deficit.

Houston lost for the third straight time despite producing 422 yards of total offense.

Trailing 21-3, the Cougars scored on their initial possession of the second half, going 85 yards on 10 plays, capped by a 4-yard touchdown pass to Mark Haffner. Two possessions later, Keenum threw a 15-yard TD pass to Tyron Carrier to cut it to 21-17 with 2:07 left in the third quarter.

Colorado State came right back with a 15-play, 73-yard scoring drive. Farris found Kory Sperry all alone in the back of the end zone for a 9-yard scoring pass to make it 28-17 with 9:27 left in the game.

The Cougars held after Mike Pagnotta gave the Rams the ball back at the 42 with an interception. Houston was within 28-25 with 2:31 left after a 3-yard TD pass from Keenum to Castile, and Keenum converted a two-point conversion pass to Castile.

The Rams ran three running plays to Johnson that netted two yards and then punted the ball away to the Cougars 32. Taking over with 1:06 remaining, Houston reached the 15-yard line with eight seconds to go. Instead of going for a tying field goal, the Cougars elected to go for the win.

Houston coach Kevin Sumlin defended the move.

"It was eight seconds and you got two plays," Sumlin said. "It should be a touchdown or an out of bounds."

"It would either be our ball out of bounds or we would kick a field goal and go to overtime," Sumlin said. "He (Keenum) just threw it a little short."

Kubiak ruined it by stepping in front of Castile in the end zone.

"It was stupid on my part, a stupid throw," Keenum said. "We knew we had three points for sure and I tried to put it in there. That's something you don't try to do as a quarterback when you have three points for sure."

Colorado State coach Steve Fairchild could only breathe a sigh of relief.

"We talked all week long that the way we were going to win this game was to make plays on all three phases," Fairchild said. "We made plays offensively and made enough plays defensively and in the kicking game, and when it was over we had enough."

The Rams led 7-0 after one quarter, but failed to convert on two other scoring chances. On the second play of the game, Farris hit Morton in stride for a 79-yard touchdown pass to put Colorado State ahead 7-0.

"That was the biggest drive of the game," Farris said. "We had to make a statement right away and I thought it helped us the rest of the half."

Kyle Bell capped a 75-yard drive with a 1-yard dive with 10:07 left in the second quarter to put Colorado State ahead 14-0.

The Cougars got their offense moving after Bell's score but faced a 4th-and-12 at the Colorado State 36. Pagnotta sacked Keenum on a safety blitz for a 15-yard loss.

The Rams cashed in and were poised for what would have been a 47-yard field goal attempt by Ben DeLine. Holder Nick Oppenneer dropped the snap but ran 14 yards to the Cougars 16. Two plays later Johnson gave Colorado State a 21-0 lead with a 7-yard TD run.

Ben Bell made it a 21-3 game with a 17-yard field goal for the Cougars as time expired in the first half.

Fairchild provided some kudos for Farris, a senior who made only his third career start.

"We are starting to develop a quarterback and Billy is going to have some growing pains," Fairchild said. "He's tough and he's a no-nonsense guy. I can yell and curse at him and he doesn't blink."

TCU 48, SMU 7: At Dallas, Joseph Turner ran for 67 yards and a pair of 4-yard touchdowns as TCU defeated SMU 48-7 on Saturday.

The Horned Frogs (4-0) outgained SMU 498-210 in total yards. The Mustangs (1-3) have allowed all four of their opponents to score more than 35 points.

TCU converted two turnovers into touchdowns less than six minutes into the game. Safety Steven Coleman recovered a fumble at the SMU 39-yard line on the second play of the game. Five plays later, Turner scored on a 4-yard run.

TCU extended its lead to 14-0 after defensive end Jerry Hughes intercepted a screen pass and returned it 24 yards for a touchdown with 9:15 left in the quarter.

Dalton was 16-of-25 for 210 yards before sitting out the final quarter. Backup quarterback Marcus Jackson led all rushers with 115 yards on seven attempts, including a 79-yard touchdown run late in the fourth.

SMU quarterback Bo Levi Mitchell completed 20-of-36 passes for 218 yards with two interceptions and one touchdown. Mustangs receiver Emmanuel Sanders led all receivers with six receptions and 62 yards.

The Horned Frogs retain the "Iron Skillet" given to the winner of the Dallas-Fort Worth rivalry. The Horned Frogs has not trailed this season and are off their its best start since 2003, when they started the season 10-0. They face a tougher matchup next week when they go on the road to play No. 2 Oklahoma.

TULSA 56, NEW MEXICO 14: At Tulsa, Okla., David Johnson threw for 469 yards and six touchdowns as Tulsa christened its newly remodeled H.A. Chapman Stadium before a capacity crowd with a 56-14 rout of New Mexico.

"That was as good as we've played, a dominating performance," said Tulsa second-year coach Todd Graham. "We talked about how there's only one way to open our new stadium for all on our fans and that's with a win. This is a good team and they proved it tonight."

Johnson, who entered the game as the nations leader in pass efficiency, completed 24-of-39 passes in a performance marred only by two interceptions.

Receivers Slick Shelley and Damaris Johnson each had two touchdown catches and exceeded 100 yards receiving. Tulsa finished with 606 yards total offense against a defense that had been allowing just 305 per game.

Tulsa's freewheeling offense and stingy defense impressed New Mexico coach Rocky Long.

"It was one of those nightmare games," Long said. "No matter what you try it doesn't work and no matter how hard you try it goes the other way. They happen once in a while.

"Tulsa is a very good team. The importance of the night had them ready to go."

Tulsa's defense chipped in as well, as Roy Roberts returned an interception 41 yards for a score as Tulsa (3-0) limited New Mexico (1-3) to 316 yards.

"Everyone came in talking about New Mexico's defense but I hope they leave talking about ours," Graham said. "I'm really proud of our kids, we had a great game plan and they really executed."

It was the second consecutive week of six scoring tosses for Johnson, a senior who backed up record-setting Paul Smith for three seasons.

Johnson directed Tulsa to touchdowns on five of its six first-half possessions, with the only miscue being an interception in the end zone by the Aggies' Glover Quin.

The situation worsened for New Mexico when quarterback Donovan Porterie was injured with 3:42 to play in the first half. Porterie had completed 11 of 13 passes for 92 yards with one interception.

Brad Gruner replaced Porterie and connected with Bryant Williams on a 21-yard touchdown pass late in the fourth quarter. New Mexico also scored on a 37-yard run by Rodney Ferguson, who gained 122 yards on 27 carries.

Johnson threw for 324 yards in the first half alone, his third consecutive game with more than 300 yards passing. Tulsa, which led the nation in total offense in 2007, has thrown for more than 300 yards in 17 consecutive games.