CLEVELAND, Ohio — After 11 games of stellar run defense, the Browns suddenly looked vulnerable against Tennessee, surrendering two explosive touchdown runs that had defensive coordinator Jim Schwartz comparing his unit to the “Keystone Cops.” Now Cleveland faces perhaps its stiffest challenge yet — a Chicago Bears offense that boasts the NFL’s second-ranked rushing attack and an offensive coordinator known for exploiting weaknesses.

Last Sunday’s defensive performance against the Titans left many questioning if Cleveland’s previously dominant run defense had sprung a leak at the worst possible time. Tony Pollard gashed the Browns for 161 yards, including touchdown runs of 65 and 35 yards, exposing potential issues with edge containment that hadn’t previously been apparent.

“I’m really

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