Here's a look at a key matchup heading into Sunday's Week 12 battle between the Eagles and Bears.
Eagles QB Michael Vick vs. the Bears' defense
The Bears match up against Vick about as well as any defense in the league because they have good speed and play a Cover-2 zone that is designed to force quarterbacks to settle for shorter, underneath throws.
The scheme should keep the Eagles from piling up big plays if the Bears are disciplined in their execution of it, and they usually are.
When Vick tries to scramble to his left — which is the direction he prefers since he's left handed — a defensive end has to be there to greet him and force him back toward the middle. Vick could still pick up a decent chunk of yardage if he has to go inside, but there will be more traffic to sort through and it should give defenders time to realize he's running and track him down. The Bears seem to be confident that they can keep Vick contained without designating one player to spy on him.
Safeties Danieal Manning and Chris Harris have to be careful not to bite when Vick looks like he's about to take off running. If they start to cheat up and Vick sets up to pass, it could result in them getting burned by one of Philadelphia's quick deep threats. Vick has plenty of arm strength and he's shown improved accuracy this season, although he'll still take some chances and throw into tight windows.
The Bears' opportunistic defense has an opportunity to become the first "D" to intercept a Vick pass in 2010.