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Colts fans should know by now that the final cornerback spots on the roster are up for grabs.

Vontae Davis and Greg Toler are locks for the roster as the projected starters while Darius Butler and Cassius Vaughn seem likely to be the third and fourth cornerbacks.

After that, however, nothing is certain.

The Colts should keep either five or six corners. Either way, at least one spot will be up for grabs. While undrafted free agents Sheldon Price and Daxton Swanson have been the hot names as potential depth corners, returning cornerback Teddy Williams may surprise people.

Williams bounced on and off the Cowboys' practice squad for two years before landing on the Colts' practice squad in the middle of last season. He was put on the active roster in November, and played in seven games on special teams down the stretch.

While Williams only got on the field, defensively, for one snap last season, he has potential with great speed as a former track star. His experience on special teams and in the Colts' locker room should help Williams in training camp this preseason.

While fans are focused on the rookies, Williams and fellow 2012 practice squad member Marshay Green may surprise people.