Clemson lost at Syracuse on Oct. 13, 2017, and fell five spots to No. 7 in the AP Top 25 the following day.

The Tigers needed a few weeks to climb back into the top-five and settled in at No. 4 after winning at No. 20 North Carolina State in early November.

The Tigers have been a fixture in the top-five ever since. On Sunday — after an open week for No. 4 Clemson — the Tigers’ streak of top-five appearances reached 50, the longest active streak in the country and the third-best in the history of the AP poll.

After only one top-five team played this weekend — three had their games called off because of COVID-19 — the AP poll was almost unchanged. Alabama remained an overwhelming No. 1 with 60 first-place votes.

The top-eight teams held their places, and overall 14 teams saw no change in their ranking from last week.

Alabama has the record for most consecutive top-five appearances in the AP poll with 68. That run was snapped last year after the Crimson Tide lost to Auburn to end its regular season with two losses.

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Alabama also is tied for the fourth-longest streak of top-five appearances with 48 from 2011-13.

The Tigers need six more weeks in the top-five to pass Miami’s streak of 55 straight top-five appearances from 2000-03. If Clemson can stay in the top-five for the rest of this season, it will be No. 2.

As for this week, Reality Check sizes up the stagnant rankings and hopes that next week provides a lot more action.

No. 1 Alabama (6-0)

Next: vs. Kentucky, Saturday.

Reality check: RB Najee Harris is making the most of his surprising return for a senior year, leading the SEC in rushing (119 yards per game) and touchdowns (14).

No. 2 Notre Dame (8-0)

Next: at North Carolina, Nov. 27.

Reality check: QB Ian Book has never been better, with 17 touchdowns accounted for (11 TD passes and six touchdown runs) and only one interception.

No. 3 Ohio State (3-0)

Next: vs. No. 9 Indiana, Saturday.

Reality check: A nit to pick with Ohio State’s offense: The Buckeyes could use a third receiver to develop and go with the excellent pair of Chris Olave and Garrett Wilson.

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No. 4 Clemson (7-1)

Next: at Florida State, Saturday.

Reality check: QB Trevor Lawrence should be back to resume his run at a Heisman after a bout with COVID-19, but can he overcome missing two games — including a really big one — when so many other quarterbacks are lighting it up?

No. 5 Texas A&M (5-1)

Next: vs. Mississippi, Saturday.

Reality check: Aggies were put on pause by COVID-19, but as long as Florida keeps rolling A&M’s victory over the Gators will keep it in the playoff picture.

No. 6 Florida (5-1)

Next: at Vanderbilt, Saturday.

Reality check: The Kyle Trask-Joe Burrow comparisons are getting pretty eerie. Trask through six games: 2,171 yards passing, 28 TDs, three INTs. Burrow through six games: 2,157 yards passing, 25 TDs, three INTs. And Trask has done it all against SEC teams.

No. 7 Cincinnati (7-0)

Next: at UCF, Saturday.

Reality check: The Bearcats have not allowed more than 17 points in a game against any of their FBS opponents. Austin Peay managed to put up 20 in a clear-the-bench blowout in September.

No. 8 BYU (8-0)

Next: vs. North Alabama, Saturday.

Reality check: Could Pac-12 teams who lose opponents to COVID-19 arrange hastily scheduled games with the Cougars, who only have two games left and open dates on Nov. 28 and Dec. 5?

No. 9 Indiana (4-0)

Next: at No. 3 Ohio State, Saturday.

Reality check: The Hoosiers have built their unbeaten start against teams (Penn State, Michigan, Michigan State) that are more famous than good this year. Combined record of opponents: 3-13.

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No. 10 Wisconsin (2-0)

Next: at No. 19 Northwestern, Saturday

Reality check: As the Badgers buried Michigan, they got 87 yards rushing and a touchdown from freshman RB Jalen Berger. He has the highest ceiling among Wisconsin’s runners.

No. 11 Oregon (2-0)

Next: vs. UCLA, Saturday.

Reality check: Through two games with a new starting quarterback and an offensive line with five new starters, the Ducks are averaging 8.16 yards per play, best in the nation.

No. 12 Miami (7-1)

Next: vs. Georgia Tech, Saturday.

Reality check: The Hurricanes dropped out of the top-10 after slipping by Virginia Tech, which is probably wise move by voters. While this has been a terrific bounce-back season for coach Manny Diaz, this isn’t a top-10 team.

No. 13 Georgia (4-2)

Next: vs. Mississippi State, Saturday.

Reality check: A healthy Bulldogs’ defense should chew up the rest of Georgia’s schedule.

No. 14 Oklahoma State (5-1)

Next: vs. No. 18 Oklahoma, Saturday.

Reality check: The Cowboys would all but wrap up a spot in the Big 12 title game if they can win Bedlam with their stingy defense.

No. 15 (tie) Coastal Carolina (7-0)

Next: at Appalachian State, Saturday.

Reality check: For all of the Chanticleers’ success, they still need to beat App State to win their Sun Belt division. And that’s not going to be easy.

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No. 15 (tie) Marshall (7-0)

Next: vs. Charlotte, Saturday.

Reality check: Among teams with more than two games, the Thundering Herd lead the nation in scoring defense at 10.1 points per game.

No. 17 Iowa State (5-2)

Next: vs. Kansas State, Saturday.

Reality check: The Cyclones are in the Big 12 race, but face a difficult back stretch with Texas and West Virginia coming after this week’s Farmageddon rivalry.

No. 18 Oklahoma (5-2)

Next: vs. No. 14 Oklahoma State, Saturday.

Reality check: The next star receiver for the Sooners: Freshman Marvin Mims has seven touchdowns on 25 catches.

No. 19 Northwestern (4-0)

Next: vs. No. 10 Wisconsin, Saturday.

Reality check: The best set of linebackers in the Big Ten play for the Wildcats, with Paddy Fisher, Chris Bergin and Blake Gallagher.

No. 20 USC (2-0)

Next: at Utah, Saturday.

Reality check: This team has looked nothing like the prohibitive favorite in the Pac-12 South, but a troubling 2-0 is still two steps closer to playing for the conference championship.

No. 21 Liberty (8-0)

Next: at North Carolina State, Saturday.

Reality check: Hugh Freeze’s team is looking to go 3-0 against the ACC. Not a bad resume builder for the former Ole Miss coach.

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No. 22 Texas (5-2)

Next: at Kansas, Saturday.

Reality check: Few teams are better than Texas at undermining themselves. The Longhorns are 119th in the country in penalties per game at 8.6.

No. 23 Auburn (4-2)

Next: vs Tennessee, Saturday.

Reality check: Auburn enters the final stretch of the season well-positioned to spoil some seasons if the offensive gains can be sustained.

No. 24 Louisiana-Lafayette (7-1)

Next: vs. Central Arkansas, Saturday.

Reality check: Ragin’ Cajuns became the first team to clinch a spot in a conference championship game. They’re the Sun Belt West champs for a third straight season. Now, can they keep coach Billy Napier away from South Carolina?

No. 25 Tulsa (4-1)

Next: vs. Tulsa, Thursday.

Reality check: If you don’t know Golden Hurricanes star Zaven Collins, you should. He might be the best linebacker in the country.

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Follow Ralph D. Russo at https://twitter.com/ralphDrussoAP and listen at https://westwoodonepodcasts.com/pods/ap-top-25-college-football-podcast/

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More AP college football: https://apnews.com/Collegefootball and https://twitter.com/AP_Top25