No. 1 Ohio State's defense is widely regarded as best in the country this season and is building a case to be considered among the greatest of all time.

First-year defensive coordinator Matt Patricia's unit is allowing 212.6 yards per game, the second-best mark through 10 games in at least 25 years, according to Sportradar. Alabama allowed 181.4 per game at a comparable point in 2011.

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