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Head injury for Pats' Mallett; Tebow debuts

The New England Patriots' No. 2 quarterback, Ryan Mallett, left Friday's preseason opener with a head injury in the second quarter, and has not returned. The team officially announced his return as questionable. Mallett is watching the second half from the sideline.

With Mallett sidelined, Tim Tebow has come on for the Patriots and it's his show to run the rest of the way.

Click here to read more on Tebow's debut.