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Andy Wittry | NCAA.com | October 14, 2018

Undefeated college football teams in 2018

There was only one FBS team that went undefeated during the 2017 college football season and that was UCF, which went 13-0 with an AAC title and Peach Bowl win against Auburn. Can any team(s) repeat the Knights' perfect season in 2018?

Here are the eight remaining undefeated college football teams for the 2018 season, listed in order of their AP Top 25 ranking, then alphabetically. 

No. 1 Alabama (7-0)

Next game: October 20 at Tennessee

The Crimson Tide easily beat Missouri, 39-10, though QB Tua Tagovailoa left the game after re-injuring his knee. He still threw for 265 yards and three touchdowns as Alabama moved to 4-0 in the SEC. The Tide defense also held Missouri QB Drew Lock to 142 passing yards and picked him off twice.

The toughest game left: Week 10 at LSU – This SEC West matchup has even more hype after LSU rocked previously undefeated No. 2 Georgia, 36-16, in Death Valley. That made the Tigers 6-1, with LSU rushing for 275 yards against the Bulldogs.

LSU represents only one of two remaining road games for Alabama, and the Tigers are the Tide's highest-ranked opponent left on its schedule and a division rival (even if Alabama leads the all-time series 52-25-5 and has won the last seven matchups).

MORE: College football weekly TV schedule and game times | Scoreboard

No. 2 Ohio State (7-0)

Next game: October 20 at Purdue

It wasn't easy for most of the game, but the Buckeyes pulled away from Minnesota for a 30-14 win. Ohio State led by only 3 points at the half, but Minnesota missed two field goals before a late Dwayne Haskins touchdown pass added insurance points.

The toughest game left: Week 13 vs. Michigan – The Buckeyes still have three conference road games left against Purdue, Michigan State and Maryland, so we're highlighting their regular season finale against The School Up North.

Sure, Ohio State has won six straight against Michigan and the Wolverines haven't won in Columbus since 2000, but they've looked impressive since losing to Notre Dame to begin the season.

RELATED: How an undefeated start helps your College Football Playoff chances

No. 3 Clemson (6-0)

Next game: October 20 vs. NC State

Clemson had no problem handing Wake Forest a home loss on Oct. 6 as they welcomed Trevor Lawrence back from an injury last week. The Tigers came out of the game with a 63-3 win over the Deacons. Dabo Swinney and company gets a rest during their bye next week before hosting NC State on Oct. 20.

The toughest game left: Week 8 vs. NC State – NC State is the only currently ranked team left on Clemson's schedule, the only other undefeated team in the ACC and by far the highest-rated of the Tigers' six remaining regular-season opponents, according to the S&P+ ratings.

The Wolfpack are almost halfway through their schedule and still undefeated. That has to mean something. Plus, a win for NC State would give the Wolfpack a one-game lead and the head-to-head tiebreaker over Clemson in the ACC Atlantic Division race.

MORE: These are the 15 oldest rivalries in college football

No. 4 Notre Dame (7-0)

Next game: October 27 vs. Navy

One week after routing ranked Virginia Tech on the road, the Irish escaped at home against Pitt, 19-14. Notre Dame trailed by eight early in the second half after a Maurice Ffrench kick return touchdown. But Ian Book passed for two touchdowns in the final two quarters to keep Notre Dame unbeaten.

The toughest game left: Week 13 at USC – Depending on how the second half of the regular season plays out, you could make the case that Notre Dame has already played (and beaten) three of the four toughest opponents on its schedule this season. The Fighting Irish already beat Michigan, Stanford and Virginia Tech, with a regular-season finale at USC still looming.

The Trojans, who were ranked in the preseason, have a top 30 defense, the benefit of home-field advantage and the potential motivation to play the role of spoiler if Notre Dame enters the game undefeated. Without a conference championship game, the Irish's College Football Playoff fate could be decided in Los Angeles.

MORE: Biggest drops in AP poll following a win

No. 10 UCF (6-0)

Next game: October 20 at East Carolina

The Knights rallied to win at Memphis, as they trailed by 16 points before scoring the final 17 points to win, 31-30. McKenzie Milton passed for 296 yards and a touchdown and added another rushing touchdown.

The toughest game left: Week 13 at South Florida – You could make a case that two games could be the toughest. Cincinnati and South Florida are both undefeated and ranked.

South Florida has already beaten Georgia Tech and Illinois, former Alabama QB Blake Barnett has filled in nicely for Quinton Flowers under center and a trip to Tampa could be the last game standing in the way of back-to-back undefeated regular seasons for UCF.

MORE: 9 winningest programs in college football history | All-time best win percentages

No. 16 NC State (5-0)

Next game: October 20 at Clemson

The Wolfpack knocked off a good Boston College team in Week 6 and now have a bye week before a road showdown with Clemson.

The toughest game left: Week 8 at Clemson – NC State controls its own fate. Beat Clemson at Clemson and the Wolfpack could make a run at the ACC Championship. But first, they'll have to face arguably the best defensive line in the country, a freshman quarterback with an 11:2 touchdown-to-interception ratio and a team that has made the last three College Football Playoffs.

No. 20 Cincinnati (6-0)

Next game: October 20 at Temple

MORE: How accurate are Lee Corso's College GameDay picks?

The Bearcats defense held Tulane to 266 total yards in its 37-21 win against the Green Wave to improve to 6-0. Cincinnati might be the top challenger to UCF in the AAC. The two teams will meet at UCF on Nov. 17.

The toughest game left: Week 12 at UCF – Everything we said complimenting UCF earlier also applies here. The Knights haven't lost since December 17, 2016. Plus, the game's at their place. A win in Week 12 could mark the arrival of the best Bearcats team since the Brian Kelly era.

No. 21 South Florida (6-0)

Next game: October 20 vs. Connecticut

The Bulls trailed Tulsa by 14 points before scoring 15 points in the fourth quarter to win, 25-24. Coby Weiss made a 22-yard field goal in the final moments to complete the rally.

The toughest game left: Week 13 vs. UCF – UCF has won 19 straight games and shows no signs of slowing down. That win streak has to mean something. With all due respect to a road game at Cincinnati in early November, a home showdown against the Knights could be the battle of undefeated teams. UCF won 49-42 last year.