How John Mateer's injury should have massive impact on Red River Rivalry

How Mateer's injury impacts Oklahoma's offense

Through four games, Mateer has completed 95-of-141 passes for 1,215 yards and tossed six touchdowns and three interceptions. He also logged 190 yards and five touchdowns on 43 carries. 

The solid stats placed him in the early Heisman conversation. In a story published Tuesday, On3's Thomas Goldkamp listed him No. 1 in his power rankings for the award. 

Who is Oklahoma's backup QB? 

Venables said QB Michael Hawkins Jr. will step in for Mateer. That may not inspire much confidence.

Hawkins played seven games last season, completing 76-of-120 passes for 783 yards and throwing three touchdowns and two interceptions. He also took 15 sacks for a loss of 60 yards. 

Hawkins looked overwhelmed in last season's matchup against Texas. In the 34-3 loss, he finished 19-of-30 passing for 148 yards and posted a below-average 45 QBR. He may struggle against the Longhorns again this season. 

No. 10 Texas (3-1) boasts an elite defense. The Longhorns have allowed the country's fourth-fewest points (7.8). In a 14-7 Week 1 loss to Ohio State, the unit held the Buckeyes to 126 yards passing. Remember, Ohio State's roster features standout wide receiver Jeremiah Smith. 

The Longhorns still have offensive issues. Entering the season, some thought the passing attack would take off with QB Arch Manning at the helm, but that hasn't happened. Texas ranks 67th in the nation in passing yards (236 YPG). 

Like Texas, No. 7 Oklahoma (4-0) features a stingy defense. The Sooners have surrendered the eighth-fewest points (nine PPG) in the country. 

But unless Hawkins improves quickly, the Longhorns should remain the favorite heading into the Red River Rivalry. As of Tuesday, ESPN Analytics gives them a 66.3% chance to win the matchup.