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Starter: Ryan Clady
Backup: Chris Clark
Ryan Clady is one of the best left tackles in the entire league, but his contract talks will be one of the biggest storylines this offseason.
Clady has made it clear he wants a long-term deal and will skip the upcoming minicamp due to the fact that he has yet to sign his franchise tender. Clady told radio hosts, via Lindsay Jones of USA Today, that he would "more than likely" be at training camp later this summer.
Starter: Zane Beadles
Backup: Manny Ramirez
3rd String: Manase Foketi
Much like Clady, Zane Beadles is entrenched at the starter and is becoming one of the league's better guards. It would not be a surprise at all to see the 6'5", 325-pound Manase Foketi beat out Ramirez for the backup job.
Starter: J.D. Walton
2nd String: Philip Blake
The Rest (in order): C.J. Davis, Quentin Saulsberry, Justin Boren
The Broncos have five players who can play center, but in the cases of C.J. Davis, Quentin Saulsberry and Justin Boren, they will need to show they could help out at another position along the line if they want to make the team.
The main competition will be between J.D. Walton and Philip Blake, and that could go either way. Walton started the year last season but sat out most of it with a broken ankle.
Starter: Lou Vasquez
Backup: Chris Kuper
This will be a very interesting battle in camp, but Lou Vasquez was brought in simply because Chris Kuper can't stay on the field. After being knocked out of the season finale in 2011 with a gruesome ankle injury, Kuper appeared in just seven games last year.
Vasquez is the insurance policy, but if Kuper loses the job to him, it's hard to envision the Broncos keeping him around.
Starter: Orlando Franklin
Backup: Vinston Painter
3rd String: Paul Cornick
Orlando Franklin will be the starter in 2013 without much doubt, but Vinston Painter is an intriguing prospect. Painter (6'4", 306 pounds) can play multiple positions along the line, and that is why the Broncos selected him in the sixth round of the draft.
He will serve as a backup in 2013 but will soak up as much as he can, especially when you throw in the fact that Alex Gibbs is working as an offensive line consultant with the team. Painter could challenge for a starting role as soon as next season.