CLEMSON, S.C. (AP) — Clemson linebacker Isaiah Simmons worked out in front of representatives for all 32 NFL teams at the school's annual pro day. Pittsburgh Steelers coach Mike Tomlin and Detroit Lions coach Matt Patricia were among those who turned out to watch Simmons and Clemson's other highly regarded junior prospects including receiver Tee Higgins and cornerback A.J. Terrell. Simmons is a 6-foot-4, 229-pound defender who became Clemson's first Butkus Award winner this past season. He led the Tigers in tackles, stops behind the line of scrimmage, sacks and pass breakups as he routinely lined up at different spots.