One of the most significant position changes during the off-season brought Anthony Zettel from defensive end to the interior defensive line. Both starting defensive tackles from last season, Kyle Baublitz and DaQuan Jones, have departed. Zettel has consistently demonstrated the ability to make big plays during his initial two seasons on the field and will be a primary contender for a starting assignment. One of the squad’s hardest workers and fiercest competitors, Zettel’s efforts during the off-season strength and conditioning program have resulted in adding more than 15 pounds of muscle. The coaching staff recognized Zettel’s play at his new position by selecting him as the recipient of the Jim O’Hora Award, presented to the defense’s most improved player during spring practice. Despite starting only two games last season, the strong and physical Zettel ranked second on the team in sacks (4.0) and third in tackles for loss (6.0). More than 35 percent of Zettel’s 16 tackles last fall resulted in a minus-yardage play, a remarkable ratio for the intense and passionate Michigan native. He played in all 12 games in 2013, making starts in the wins over Michigan and Illinois. In his first career start, against No. 18 Michigan, he grabbed his first career interception, returning it 18 yards to set up a touchdown. Zettel is among three defensive returnees from Michigan, joining linebacker Charles Idemudia and defensive end C.J. Olaniyan.