Why these teams should be on upset alert

With only four games involving two ranked teams this weekend, there are plenty of ranked teams squaring off against opponents they’re expected to beat.

But those teams may want to watch out this weekend, as they’ve been here before and it hasn’t always gone well.

Tennessee at 1 Alabama

Alabama hasn’t had much trouble with Tennessee lately -- or anybody for that matter -- but back in 2009, the Tide were 7-0 entering a home game with the 3-3 Volunteers. Still looking for its first national title since 1992, Alabama didn’t score a TD all day and needed two blocked field goals from Terrence Cody, including one on the game’s final play, to beat the Vols, 12-10.

It was the closest game they played on their way to an undefeated national championship, their first of three in a four-year span.

NC State at 2 Florida State

NC State hosted No. 3 Florida State last season, just two weeks after the ‘Noles beat No. 10 Clemson by double digits. But Mike Glennon threw a touchdown on fourth down with just 16 seconds remaining to stun Florida State and effectively knock them out of the BCS picture.

In fact, the past four times these teams met with Florida State ranked and NC State unranked, the Wolfpack won the game.

Penn State at 4 Ohio State

Penn State has won two of the past three meetings in Columbus after losing each of its first seven games at Ohio Stadium. Its first win there came in 2008, when the No. 3 Nittany Lions beat the No. 9 Buckeyes, 13-6. Trailing 6-3, the Nittany Lions forced a Terrelle Pryor fumble on 3rd-and-1 early in the fourth quarter, and backup Pat Devlin immediately led them on a touchdown drive to take a lead they wouldn’t relinquish.

Wake Forest at 7 Miami (FL)

Wake Forest and Miami (FL) last met in 2009 in Winston-Salem. The Demon Deacons came in with a 4-4 record, but they jumped out to a 17-0 lead and led by 13 heading to the fourth quarter. Then, Miami’s Jacory Harris threw two touchdown passes, including the game-tying score with 1:08 left, before the PAT gave the 19th-ranked Hurricanes a one-point win.

8 Baylor at Kansas

Baylor’s last visit to Kansas came two years ago, and the No. 25 Bears trailed the Jayhawks 24-3 in the fourth quarter. But eventual Heisman winner Robert Griffin III led 3 touchdown drives -- needing only 14 plays to cover 267 yards -- to send it to overtime, and Baylor won when Kansas failed on its two-point conversion try.

19 Oklahoma State at Iowa State

Oklahoma State was 10-0 and ranked second in the BCS Standings when it visited Iowa State on a Friday night two years ago. The Cowboys were 27-point favorites over the 5-4 Cyclones, a week before their rivalry game with No. 5 Oklahoma. They led 24-7 in the third quarter, but Iowa State scored 17 straight to send it to overtime. In the second overtime, Brandon Weeden was intercepted and Iowa State won it with a four-yard TD run.

20 Louisville at South Florida

Last year, No. 16 Louisville was 6-0 when it hosted a 2-4 South Florida team. The Bulls scored 15 straight points in the fourth quarter to take a five-point lead, but Teddy Bridgewater threw an 11-yard touchdown pass with 1:35 left to seal the victory.