Playing fast and furious with nothing to lose against a third-ranked Alabama team still smarting from a miracle loss to Auburn, Oklahoma pulled off a Sugar Bowl upset in the Mercedes-Benz Superdome on Thursday.

Oklahoma quarterback Trevor Knight completed 32 of 44 passes for 348 yards, four touchdowns and one interception to lead the Sooners to a 45-31 victory against Alabama.

Both teams alternated scores in a see-saw first half.

Alabama scored first on a 1-yard touchdown by running back T.J. Yeldon that made the score 7-0.

Oklahoma's Mike Hunnicutt hit a 47-yard field goal to tie the score at 17 with 11:45 left in the second quarter.

Then, the Sooners finished the half with a flurry.

Knight threw a 43-yard touchdown pass to Jalen Saunders to make the score 24-17 with 2:59 remaining.

Receiver Sterling Shepard scampered around end for a 13-yard touchdown run on a reverse to mkae the score 31-17 with 1:05 left. It was the Sooners' fifth consecutive possession resulting in points.

Alabama freshman Derrick Henry scored on a 43-yard touchdown run to cut the score to 31-24 in the third quarter.

But Oklahoma increased its lead back to 14 points when Knight threw a 9-yard touchdown pass to Shephard with 10:44 left in the game.

Alabama cut the lead to seven points again when Henry caught a swing pass from AJ McCarron and raced 60 yards for a touchdown with 6:22 remaining