Arizona State issues on the offensive line just got a little worse.
Sophomore Zach Schlink, listed No. 1 at right guard on the preseason depth chart, has opted to "retire" due to longstanding knee problems.
The math up front for the Sun Devils isn't encouraging: When guard Jon Hargis went down with a knee injury during spring practices, that left only center/guard Garth Gerhart as a returning starter from a 2009 unit that struggled.
It's likely that sophomore Adam Tello will replace Schlink with the No. 1 offense. The other starting guard, junior Matt Hustad, also has battled knee injuries throughout his career. He started five games in 2009 before a knee injury ended his season. He also missed the 2008 season with a knee injury.
Schlink's promising career never really got started. The sophomore, who saw significant action as a true freshman, has required four knee operations and didn't play last season.
Also seeing his Sun Devils career end due to injuries is defensive tackle Otis Jones, but his loss is not as painful because ASU is deep at defensive tackle, where Jones was slated to be a reserve.