Time to check out the big games, top matchups and potential upsets as college football heads into Week 5.

Top 25 Action:
No. 8 Alabama (4-0, 1-0 SEC) at No. 3 Georgia (4-0, 1-0 SEC), Saturday 7:45 PM ET ESPN
In their 27-10 win over Arizona State last week, the Bulldogs were able to physically dominate ASU in the trenches, but questions still remain about their inexperienced offensive line. After having trouble with South Carolina’s front four two weeks ago, UGA head coach Mark Richt made some changes that at the very least, worked in the win over ASU. But the Bulldogs’ offensive line will get another stiff test this week against a physical defensive front of Alabama. Tide head coach Nick Saban has his team believing they can win and their 328-92 rushing dominance in a win at Arkansas last week was nothing short of impressive. Last year ‘Bama gave Georgia everything they could handle before finally losing 26-23 in overtime in Tuscaloosa. So it should be another great SEC battle “between the hedges” this Saturday. Georgia is currently a 6.5-point favorite.

No. 24 TCU (4-0, 1-0 MWC) at No. 2 Oklahoma (3-0, 2-0 home), Saturday 7:00 PM ET
The Sooners wrap up their non-conference schedule by hosting an undefeated TCU team that ranks 13th in the nation in points scored. Of course, Oklahoma is the top ranked program in that category, so lets not get ahead ourselves in predicting an upset. The Sooners have outscored opponents 164-42 and are second in the nation with a 40.7 average margin of victory. OU head coach Bob Stoops has been around the block more than enough to know his team can’t relax before conference play. Oklahoma is an 18.5-point home favorite.

No. 22 Illinois (2-1, 0-1 away) at No. 12 Penn State (4-0, 3-0 home)
Entering the season, Ohio State and Wisconsin were considered the class of the Big Ten. While that might still be the case, the conference produces an underrated matchup this Saturday in Happy Valley when the Nittany Lions host the Illini. So far this season, PSU has one of the best offenses in the nation, ranking sixth in total yards, 31st in passing yards, eighth in rushing yards and third in points scored. But the last time the Lions squared off against Illinois, they turned the ball over three times inside the Illini’ 30-yard line in a surprising 27-20 loss in Champaign. Film of that game will almost certainly be shown to PSU players leading up to Saturday’s game. Illinois is currently a 15-point road dog.

Upset Watch:
Tennessee at No. 15 Auburn Saturday 3:30 PM ET CBS
Considering they were crushed 30-6 by Florida last Saturday, not too many people will give the Vols a chance this weekend against the Tigers, who are coming off a narrow loss to No. 6 LSU. But Tennessee played better against the Gators than the final score indicated. The UT defense surrendered only 16 first downs and 243 yards against the high-powered Florida offense. That bodes well this week when they take on an Auburn offense that has only managed 17 points in their first eight quarters against SEC opponents and is largely still a work in progress. Oddsmakers have established Auburn as a 6.5-point favorite.

Other notable games:
No. 1 USC at Oregon State, Thursday 9:00 PM ET ESPN
Remember the last time USC traveled to Corvallis? The Trojans certainly do.

Mississippi State at No. 5 LSU Saturday 7:30 PM ESPN2
The Tigers are coming off a huge win last week in Auburn. Will they have a letdown against unranked Mississippi State?

Arkansas at No. 7 Texas Saturday 3:30 PM ET ABC
Bobby Petrino’s bunch were hammered last week at home against Alabama. Petrino can probably count on similar results this week in Austin.