In the biggest upset this year in U.S. college football, the top-ranked Oklahoma Sooners have suffered a crushing 35-7 loss to the 15th-ranked Kansas State Wildcats.
Kansas State stunned the Sooners in the Big 12 conference title game with three touchdown passes in the second quarter alone, including two of at least 60 yards.
The previously undefeated Sooners had been certain to win a bid for next month's national college football championship, but their unexpected loss Saturday could cost them a shot at the title.
The Bowl Championship Series standings will be announced late Sunday. The top two BCS teams will play in the national championship Sugar Bowl game on January 4 in New Orleans, Louisiana.
Second-ranked Southern California and number-three Louisiana State both posted impressive wins Saturday, but like Oklahoma, still have one loss to blemish their records this season. Which two of those three teams will play for the national title remains in doubt until the complicated BCS system results are announced.
The system involves rankings by national coaches and media polls, a computer average of several other ranking services, the calculated strength of opponents throughout the season, and bonus points for victories over highly rated teams.
The Southern Cal Trojans closed out their regular season Saturday with a 52-28 win over the Oregon State Beavers behind five touchdown passes from quarterback Matt Leinart.
The Louisiana State Tigers defeated the seventh-ranked Georgia Bulldogs, 34-13 late Saturday in the Southeastern Conference title game.