Updated

Four games into the season, the Arizona Cardinals are turning to an undrafted second-year pro to step in at the crucial left tackle position.

Bradley Sowell, claimed off waivers from Indianapolis before the season began, will get the start Sunday against Carolina.

The biggest opportunity of Sowell's career comes after the Cardinals traded starter Levi Brown to the Pittsburgh Steelers on Wednesday for a conditional draft pick.

While Brown was the No. 5 pick overall out of Penn State in 2007, Sowell went undrafted out of Mississippi State last year. Initially, he signed with Tampa Bay but was released before the 2012 season began, then signed with Indianapolis.

___

AP NFL website: www.pro32.ap.org

___

Follow Bob Baum at www.twitter.com/Thebaumerphx