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No matter how hard they try to focus downfield, most quarterbacks can't help but check their blind spots for the most feared player on the football field.

It's the pass-rusher, and every year there are players who emerge as unblockable forces to shore up defenses and blow up plays before they start.

From a stable of stud linemen in the ACC to a pair of difference-makers in the SEC and Big Ten to an unheralded prospect on the national scale who already has proved himself in his league, college football is full of elite players who are born and bred to chase quarterbacks.

Some come from the edges, and some play with their hands down on the interior. Others get a running start from the second level of the defenses. The smartest defensive coordinators move them around to confuse offensive linemen and signal-callers alike.

They're the quarterback's worst nightmare, and whether they're freakish athletes like LSU's Arden Key or Boston College's Harold Landry or full-force walls of bulk like Clemson's Dexter Lawrence, they're sprinkled across the landscape of the sport.

Let's take a look at the top pass-rushers in all of college football.