Quarterback Adrian Martinez, who had a record-setting freshman season in 2018 for Nebraska but struggled at times in 2019, will take the first snaps after competing with redshirt freshman Luke McCaffrey in the preseason.Quarterback Adrian Martinez, who had a record-setting freshman season in 2018 for Nebraska but struggled at times in 2019, will take the first snaps after competing with redshirt freshman Luke McCaffrey in the preseason.