Just five weeks into the season, the undefeated field has dropped from 136 to 20. Last year, Oregon was the last team standing, going perfect through the regular season and the conference championships until a loss to Ohio State in the CFP quarterfinals. 

Here are some of the undefeated teams to watch in Week 6: 
*Undefeated team is bolded

    No. 11 Texas Tech at Houston, 7 p.m. on Saturday, Oct. 4
        With both squads undefeated, this is the only game of the weekend that guarantees a team getting knocked off the list. 
    No. 16 Vanderbilt at No. 10 Alabama, 3:30 p.m. on Saturday, Oct. 4
        Can the Vanderbilt do it again? The road to 6-0 runs through Tuscaloosa for the Commodores. 
     No. 3 Miami (Fla.) at No. 18 Florida State, 7:30 p.m. on Saturday, Oct. 4
        This is the Hurricanes' first road game of the season, and the Seminoles would love nothing more than to hand their in-state rival a '1' in the loss column. 
    Louisville vs. No. 24 Virginia, 3:30 p.m. on Saturday, Oct. 4
        Virginia knocked Florida State off the unbeaten list last week, and the Cavaliers look to roll that momentum into their matchup with the Cardinals. 
    No. 6 Texas A&M vs. Mississippi State, 7:30 p.m. on Saturday, Oct. 4
        The Bulldogs took No. 15 Tennessee to overtime last weekend, proving to be a real threat to the top half of the SEC. The Aggies better be ready to play Saturday night to stay unblemished. 
The ESPN College GameDay crew is headed to Tuscaloosa for the anticipated rematch between No. 10 Alabama vs. No. 16 Vanderbilt. Historically, this decision would have turned heads as the Tide had won 46 of the past 48 matchups coming into last season, carrying a 23-game win streak into the 2024 showdown. 

But times are changing in Nashville. The 'Dores carried last year's momentum into 2025 as Clark Lea has Vanderbilt at No. 16 in the polls — its highest rank since 2008 and the only other year the Commodores have been involved in a College GameDay matchup. 

Vandy quarterback Diego Pavia has the third-highest QBR in the nation, and the Commodore offense is humming, averaging the fourth-most points per game in the FBS (49). They haven't seen an Alabama-caliber opponent this season, but no one can deny the hot start in Nashville. 

As for the home team, the Tide just knocked off No. 5 Georgia for the 10th time in their last 11 matchups, bouncing back in a huge way after a Week 1 loss to Florida State. Quarterback Ty Simpson seems to have found his groove under center, throwing for 658 and six TDs in his last two games.