Austin Simmons threw for 252 yards and four touchdowns in a Missouri debut that lasted less than a half, and the No. 25 Tigers rolled to a season-opening 54-14 victory over Arkansas-Pine Bluff on Thursday night. Simmons lost the starting job to Trinidad Chambliss at Ole Miss following an injury last season. “I had some jitters pregame and I was a little nervous, thinking about how things were going to go,” Simmons said.