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The biggest potential weakness for each top College Football Playoff contender

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Wisconsin's QB situation with Mertz testing positive (1:10)

Adam Rittenberg outlines the possibility of Wisconsin's game vs. Nebraska being canceled after two Badgers quarterbacks test positive. (1:10)

There is no such thing as a perfect team in college football. Every team has some type of flaw, but it's the number of weaknesses and the magnitude of them that separate the bad teams from the good and the good from the elite.

With the help of PFF's unique play-by-play grading and advanced database, we can easily spot the biggest flaw of each team in college football. Below, you'll find the top 10 teams that are in the running for a spot in the College Football Playoff and their biggest weakness, as well as our analysis on how concerned you should be about said weakness. Please note that these 10 teams do not reflect our top 10 teams in college football -- this list includes the teams that have the best chance at making the playoff based on what has already happened and what we think will happen with each of their respective schedules.

Ohio State Buckeyes

Biggest weakness: It has been only one game, but the interior offensive line did not look great against a subpar Nebraska pass-rush unit.